Merge seed-compat (item-table cross-validation vs C reference)

Instrumented the C game on modern-rogue with a DUMP mode (patch in
testdata/c_seedcompat.patch) that forces the RNG seed and prints the
per-seed item appearance tables — potion colors, scroll names, ring
stones, wand/staff materials — in the normal init order, before initscr
so no terminal is needed. Captured its output for four seeds as
testdata/item_tables.golden.

TestSeedCompatItemTables regenerates the same tables from the Go port
via New(Params{Seed, Wizard: true}) and checks they match the golden
byte for byte. They do, for all four seeds — proving the LCG and its
consumption order through the whole init sequence (init_probs →
init_player → init_names → init_colors → init_stones → init_materials,
including init_player's arrow rnd(8)+rnd(15)) agree with C exactly.

testdata/README.md documents how to regenerate the golden.

ARCHITECTURE.md

@@ -1076,7 +1076,7 @@ that `game` itself has no third-party imports:
 go.mod                        module git.eeqj.de/sneak/rgoue
 cmd/rogue/main.go             package main — flag parsing, constructs RogueGame, calls Run
 game/                         package game — the port, one .go file per .c file
-    game.go                   RogueGame struct, NewGame, Run  (main.c)
+    game.go                   RogueGame struct, New, Run      (main.c)
     rng.go                    seeded LCG                      (main.c: rnd/roll + RN macro)
     types.go                  Coord, Stats, flags, constants  (rogue.h)
     object.go                 Object type                     (rogue.h THING _o arm)
@@ -1086,7 +1086,7 @@ game/                         package game — the port, one .go file per .c fil
     init.go                   per-game randomization          (init.c)
     command.go                command dispatch                (command.c)
     io.go                     message/status line             (io.c)
-    screen.go                 Screen: tcell wrapper + Window  (curses + mdport display shims)
+    screen.go                 Terminal iface, Screen, Window  (curses + mdport display shims)
     newlevel.go               level orchestration             (new_level.c)
     rooms.go                  room/maze generation            (rooms.c)
     passages.go               corridors                       (passages.c)
@@ -1099,12 +1099,13 @@ game/                         package game — the port, one .go file per .c fil
     potions.go, scrolls.go, rings.go, sticks.go, weapons.go, armor.go
     misc.go                   look(), eat, direction input    (misc.c)
     daemon.go                 scheduler                       (daemon.c)
-    daemons.go                the 11 callbacks                (daemons.c)
+    daemons.go                daemon/fuse callbacks           (daemons.c)
     options.go                options screen + ROGUEOPTS      (options.c)
     wizard.go                 wizard commands, identify       (wizard.c)
     rip.go                    tombstone, victory, scores      (rip.c)
     save.go                   save/restore via gob            (save.c + state.c)
     score.go                  scoreboard                      (score.h + rip.c/save.c score I/O)
+term/tcell.go                 package term — tcell-backed Terminal (curses + mdport input/display)
 ```
 
 `mach_dep.c`, `mdport.c`, `xcrypt.c`, `state.c`, `list.c`, `vers.c` have no
@@ -1120,7 +1121,7 @@ coherent, but everything is reachable from `g`.
 
 ```go
 // RogueGame is one complete game of Rogue: all state that was global in the
-// C implementation, plus the terminal it plays on. Construct with NewGame,
+// C implementation, plus the terminal it plays on. Construct with New,
 // then call Run.
 type RogueGame struct {
     // --- identity / RNG ---
@@ -1138,7 +1139,7 @@ type RogueGame struct {
     Level    Level     // map, rooms, passages, level objects, monsters
     Depth    int       // C `level`
     MaxDepth int       // C `max_level`
-    Amulet   bool
+    HasAmulet  bool
     SeenStairs bool
 
     // --- turn/command engine ---
@@ -1155,7 +1156,7 @@ type RogueGame struct {
     ToDeath, Kamikaze, HasHit bool
     MaxHit   int
     Take     byte      // glyph of thing picked up this move
-    Delta    Coord     // last direction from GetDir
+    Delta    Coord     // last direction from promptDirection
     DirCh    byte
     LastComm, LastDir     byte   // command repeat state ('a' command)
     LLastComm, LLastDir   byte
@@ -1167,7 +1168,7 @@ type RogueGame struct {
 
     // --- messages / UI ---
     scr      *Screen     // tcell-backed terminal (stdscr + hw scratch window)
-    Msgs     MsgLine   // msgbuf/newpos/mpos/huh/save state
+    Msgs     MessageLine // msgbuf/newpos/mpos/huh/save state
     Options  Options     // terse, jump, seefloor, passgo, flush, tombstone, inv_type...
     StatMsg  bool
     InvDescribe bool
@@ -1182,26 +1183,29 @@ type RogueGame struct {
     LastScore int
     AllScore  bool
     ScorePath string
+
+    // --- static data tables (extern.c/init.c ROM) ---
+    data     *gameData // this game's copy of the immutable C tables (§4.7)
 }
 ```
 
 Player-centric C globals move onto `Player`, world-centric onto `Level` (see
 §4/§5); the remainder sit directly on `RogueGame` with the original semantics.
 The command.c/io.c/things.c file-statics become lowercase fields of `RogueGame`,
-`MsgLine`, and the inventory pagination helper respectively.
+`MessageLine`, and the inventory pagination helper respectively.
 
 ### Entrypoints
 
 ```go
-func NewGame(opts Config) *RogueGame   // Config: seed, name, ROGUEOPTS string, score path, wizard
+func New(params Params) *RogueGame      // Params: seed, name, ROGUEOPTS string, score path, wizard
-func (g *RogueGame) Run() error        // main.c main()+playit(): init tables, first level, daemons, loop
+func (g *RogueGame) Run()               // main.c main()+playit(): init tables, first level, daemons, loop
 func (g *RogueGame) command()           // one turn (command.c)
-func Restore(path string, opts Config) (*RogueGame, error)  // save.c restore()
+func Restore(path string, params Params) (*RogueGame, error)  // save.c restore()
 ```
 
 `cmd/rogue/main.go` is a thin shell: flags (`-s` scores, `-d` death demo,
-save-file arg, `SEED`/`ROGUEOPTS` env), `NewGame(...)` or `Restore(...)`,
+save-file arg, `SEED`/`ROGUEOPTS` env), `New(...)` or `Restore(...)`, `Run()`,
-`Run()`, exit code.
+exit code.
 
 ## 4. Core types
 
@@ -1214,9 +1218,9 @@ type Stats struct {
     Str        int      // str_t; 3..31
     Exp        int
     Lvl        int
-    Arm    int      // armor class, lower is better
+    ArmorClass int      // armor class, lower is better (was s_arm)
     HP         int      // s_hpt
-    Dmg    string   // damage dice "1x4/1x2" — kept as string, parsed by rollEm
+    Dmg        DiceSpec // damage dice, parsed once by ParseDice (§4.3)
     MaxHP      int
 }
 ```
@@ -1268,29 +1272,31 @@ both the AI and the save format rely on.
 
 ```go
 type Object struct {
-    Type    byte      // POTION '!', SCROLL '?', WEAPON ')', ...
+    Kind       ObjectKind // item category (was o_type); Glyph() gives the map char
     Pos        Coord
     Text       string     // scroll gibberish
-    Launch  int       // launcher weapon index, -1 none
+    Launch     WeaponKind // launcher weapon (noWeapon if none)
     PackCh     byte       // inventory letter
-    Damage  string    // wield dice
+    Damage     DiceSpec   // wield dice, parsed once
-    HurlDmg string    // thrown dice
+    HurlDmg    DiceSpec   // thrown dice
     Count      int        // stack size
-    Which   int       // subtype (P_HEALING, MACE, R_PROTECT, ...)
+    Which      int        // subtype index (P_HEALING, MACE, R_PROTECT, ...)
     HPlus, DPlus int
-    Arm     int       // OVERLOADED, as in C: armor class | charges | gold value
+    ArmorClass int        // armor only  (was part of the overloaded o_arm)
+    Charges    int        // wands/staffs
+    GoldValue  int        // gold piles
+    Bonus      int        // rings (protection, add strength, ...)
     Flags      ObjFlags
     Group      int        // stack group id
     Label      string     // player-applied name
 }
-
-func (o *Object) Charges() int     { return o.Arm }   // sticks
-func (o *Object) SetCharges(n int) { o.Arm = n }
-func (o *Object) GoldVal() int     { return o.Arm }   // gold piles
 ```
 
-The overload stays (one field, named accessors) so ported arithmetic like "rust:
+The single C `o_arm` field was overloaded (armor class | charges | gold value |
-`o.Arm++`" keeps its original shape.
+ring bonus). The port splits it into four honest fields (step 3); `o_type`
+became a typed `ObjectKind` distinct from the display glyph (step 2). Damage
+strings are parsed once into a `DiceSpec` (`[]DiceRoll`) at table-definition
+time rather than re-parsed on every swing.
 
 ### 4.4 Flags
 
@@ -1301,11 +1307,11 @@ type RoomFlags uint16
 type PlaceFlags uint8
 
 const (
-    CanHuh CreatureFlags = 1 << iota // creature can confuse
+    CanConfuse CreatureFlags = 1 << iota // ISHUH: creature can confuse
-    CanSee; IsBlind; IsCanc; IsFound; IsGreed; IsHaste; IsTarget
+    CanSeeInvisible; Blind; Cancelled; Found; Greedy; Hasted; Targeted
-    IsHeld; IsHuh; IsInvis; IsMean; IsRegen; IsRun; IsFly; IsSlow
+    Held; Confused; Invisible; Mean; Regenerates; Awake; Flying; Slowed
     // hero aliases sharing C bit values are separate named constants:
-    IsLevit = IsCanc; IsHalu = IsMean; SeeMonst = IsFly
+    Levitating = Cancelled; Hallucinating = Mean; SenseMonsters = Flying
 )
 
 func (f CreatureFlags)  Has(b CreatureFlags) bool
@@ -1313,10 +1319,11 @@ func (f *CreatureFlags) Set(b CreatureFlags)
 func (f *CreatureFlags) Clear(b CreatureFlags)
 ```
 
-C's `on(player, ISHALU)` ports to `g.Player.Flags.Has(IsHalu)`. The C bit
+The C `IS*`/`CAN*` macro names became descriptive Go constants in step 1
-collisions (ISCANC/ISLEVIT, ISMEAN/ISHALU, ISFLY/SEEMONST) are preserved as
+(`ISHUH`→`Confused`, `SEEMONST`→`SenseMonsters`, `ISRUN`→`Awake`, ...). C's
-equal values — they are disjoint by owner (monster vs hero), and the save format
+`on(player, ISHALU)` ports to `g.Player.On(Hallucinating)`. The C bit collisions
-keeps working.
+(ISCANC/ISLEVIT, ISMEAN/ISHALU, ISFLY/SEEMONST) are preserved as equal values —
+they are disjoint by owner (monster vs hero), and the save format keeps working.
 
 ### 4.5 Level and Place
 
@@ -1336,7 +1343,7 @@ type Level struct {
     Objects  []*Object     // lvl_obj
     Monsters []*Monster    // mlist
     Stairs   Coord
-    NTraps   int
+    TrapCount int
 }
 
 func (l *Level) At(y, x int) *Place          // INDEX
@@ -1345,8 +1352,16 @@ func (l *Level) SetChar(y, x int, ch byte)
 func (l *Level) FlagsAt(y, x int) *PlaceFlags // flat
 func (l *Level) MonsterAt(y, x int) *Monster  // moat
 func (l *Level) VisibleChar(y, x int) byte    // winat: disguise if monster, else Ch
+func (l *Level) ObjectAt(y, x int) *Object    // find_obj
+func (l *Level) AddObject(o *Object)          // attach to lvl_obj
+func (l *Level) RemoveObject(o *Object)
+func (l *Level) AddMonster(m *Monster)        // attach to mlist
+func (l *Level) RemoveMonster(m *Monster)
 ```
 
+Object and monster list management (attach/detach on `lvl_obj`/`mlist`) and the
+`find_obj` lookup are `Level` methods (step 6), not free functions on `g`.
+
 ### 4.6 Room
 
 ```go
@@ -1362,14 +1377,18 @@ type Room struct {
 
 ### 4.7 Static tables
 
-`tables.go` holds the immutable data as package-level **constants and `var`
+`tables.go` holds the immutable data from extern.c/init.c on a `gameData`
-tables that are never written after init** (the only permitted package-level
+struct, built by `newGameData()` and hung on each game as `g.data`. Every game
-data — they are ROM, not state): `monsterTable [26]MonsterKind` (name, carry %,
+carries its own copy, so the package keeps **no** non-constant package-level
-flags, stats), `initDam` weapon table, base `objInfo` tables (copied into
+state (the linter's `gochecknoglobals` is clean): `monsterTable [26]MonsterKind`
-`RogueGame.Items` at NewGame so per-game mutation — probability resumming,
+(name, carry %, flags, stats), the `initWeaps` weapon table, base `ObjInfo`
-`oi_know`, `oi_guess` — stays instance-local), `eLevels`, `rainbow`, `stones`,
+tables (copied into `RogueGame.Items` at New so per-game mutation — probability
-`woods`, `metals`, `sylls`, trap names, help text, `lvlMons`/`wandMons` spawn
+resumming, `Know`, `Guess` — stays instance-local), `eLevels`, `rainbow`,
-strings, `hNames`/`mNames` combat messages.
+`stoneTable`, `woods`, `metals`, `sylls`, trap names, help text,
+`lvlMons`/`wandMons` spawn strings, `hNames`/`mNames` combat messages, and the
+effect-dispatch handler tables (§5, step 7). Nothing on `gameData` is written
+during play, except that the game's own `Monsters` copy (not the template) takes
+the venus-flytrap damage hack.
 
 ```go
 type ObjInfo struct {
@@ -1408,9 +1427,9 @@ func (r *Rng) next() int {            // the RN macro
     r.Seed = r.Seed*11109 + 13849     // 32-bit wraparound, as C int
     return int(r.Seed>>16) & 0xffff
 }
-func (g *RogueGame) Rnd(rng int) int  // rnd(): 0 if range==0 else abs(RN)%range
+func (g *RogueGame) rnd(rng int) int  // rnd(): 0 if range==0 else abs(RN)%range
-func (g *RogueGame) Roll(n, sides int) int
+func (g *RogueGame) roll(n, sides int) int
-func (g *RogueGame) Spread(n int) int // misc.c: n ± 10%
+func (g *RogueGame) spread(n int) int // misc.c: n ± 10%
 ```
 
 Same seed → same dungeon, byte for byte. This is the port's master correctness
@@ -1424,10 +1443,12 @@ small integers. The port makes that mapping primary:
 ```go
 type DaemonID int
 const (
-    DRollwand DaemonID = iota + 1 // matches state.c save ids
+    DNone DaemonID = iota          // empty slot
+    DRollwand                      // matches state.c save ids
     DDoctor; DStomach; DRunners; DSwander
     DNohaste; DUnconfuse; DUnsee; DSight
-    DVisuals; DComeDown; DLand    // extra fuses beyond the C save map
+    DVisuals; DComeDown; DLand
+    DTurnSee                       // potions.c casts turn_see to a fuse callback
 )
 
 type delayedAction struct {
@@ -1447,21 +1468,30 @@ func (g *RogueGame) Fuse(f DaemonID, arg, time, typ int)
 func (g *RogueGame) Lengthen(f DaemonID, xtime int)
 func (g *RogueGame) Extinguish(f DaemonID)
 func (g *RogueGame) KillDaemon(f DaemonID)
-func (g *RogueGame) DoDaemons(flag int)   // dispatches via one switch on DaemonID
+func (g *RogueGame) DoDaemons(flag int)   // fires the ready daemons/fuses
 func (g *RogueGame) DoFuses(flag int)
 ```
 
-The 11 callbacks in daemons.go become methods (`g.doctor()`, `g.stomach()`, ...)
+The callbacks in daemons.go become methods (`g.doctor()`, `g.stomach()`, ...).
-invoked from the dispatch switch. This is more robust than function values
+`runDaemon` looks the callback up in a `daemonHandlers` table on `gameData` (the
-because it is comparable and serializable — the two properties the C design
+C `d_func` function pointers restored as method expressions, step 7). A
-needed pointers for.
+`DaemonID` is comparable and serializable — the two properties the C design
+needed function pointers for — so it is also what the save format stores.
 
 ### 5.3 Screen — curses → tcell
 
 ```go
-// Screen wraps tcell and exposes the curses vocabulary the ported code speaks.
+// Terminal is the physical device, behind an interface so tests run headless.
+// The real game uses term.Tcell; tests use a scripted testTerm.
+type Terminal interface {
+    Render(w *Window)  // blit a window to the device
+    ReadChar() byte    // event loop → C char codes (arrows→hjkl, ^C→quit)
+    Fini()             // restore the device (curses endwin) on exit
+}
+
+// Screen exposes the curses vocabulary the ported code speaks, over a Terminal.
 type Screen struct {
-    T       tcell.Screen
+    term Terminal
     Std  *Window   // stdscr equivalent (the game map is drawn here)
     Hw   *Window   // the scratch window for inventory/help overlays
 }
@@ -1471,10 +1501,11 @@ type Screen struct {
 type Window struct{ ... }
 func (w *Window) Move(y, x int); func (w *Window) AddCh(ch byte)
 func (w *Window) MvAddCh(y, x int, ch byte); func (w *Window) MvAddStr(y, x int, s string)
-func (w *Window) Printw(format string, a ...any); func (w *Window) Inch(y, x int) byte
+func (w *Window) Printwf(format string, a ...any); func (w *Window) Inch(y, x int) byte
 func (w *Window) Clear(); func (w *Window) Clrtoeol(); func (w *Window) Standout(on bool)
-func (s *Screen) Refresh(w *Window)         // blit buffer to tcell
+func (s *Screen) Refresh()                  // blit stdscr to the device
-func (s *Screen) ReadChar() byte            // event loop → C char codes (arrows→hjkl, ^C→quit)
+func (s *Screen) RefreshWin(w *Window)      // blit any window
+func (s *Screen) Fini()                     // tear the device down
 ```
 
 Ported drawing code keeps its structure: `mvaddch(y, x, ch)` →
@@ -1488,20 +1519,24 @@ SIGHUP/SIGTERM → `autoSave` via `os/signal`.
 ### 5.4 Messaging
 
 ```go
-type MsgLine struct {
+// MessageLine owns the io.c message machinery and the top screen line, wired
+// to its screen/redraw/input needs via attach() (step 6).
+type MessageLine struct {
     buf      strings.Builder // msgbuf/newpos
     Mpos     int             // cursor col on the message line
     Huh      string          // last message (Ctrl-R repeat)
     SaveMsg  bool; LowerMsg bool; MsgEsc bool
+    scr      *Screen; look func(bool); readChar func() byte
 }
-func (g *RogueGame) Msg(format string, a ...any) bool  // msg(); returns ESC-pressed
+func (m *MessageLine) Msg(format string, a ...any) int  // msg(); ^Escape / Escape
-func (g *RogueGame) AddMsg(format string, a ...any)
+func (m *MessageLine) Addf(format string, a ...any)
-func (g *RogueGame) EndMsg() bool
+func (m *MessageLine) End() int
 ```
 
-C's `%s`+`vowelstr` message assembly ports directly on `fmt`. The io.c
+`RogueGame` keeps one-line `g.msg` / `g.addmsgf` / `g.endmsg` shorthands over
-status-line shadow statics become fields of an unexported `statusCache` struct
+`g.Msgs`, so the ~400 ported call sites are unchanged. C's `%s`+`vowelstr`
-on `RogueGame`.
+message assembly ports directly on `fmt`. The io.c status-line shadow statics
+become fields of an unexported `statusCache` struct on `RogueGame`.
 
 ### 5.5 Options
 
@@ -1519,29 +1554,34 @@ holding closures.
 ### 5.6 Save/restore — gob replaces state.c
 
 The 2,134-line hand-rolled serializer exists because C cannot reflect. Go can:
-the save file is `encoding/gob` of a `SaveState` snapshot struct
+the save file is `encoding/gob` of a `SaveState` snapshot struct (version-tagged
-(version-tagged, gzip-compressed). C-format saves are **not** readable — the
+with `Release + "-go3"`; no compression). C-format saves are **not** readable —
-formats were never cross-version compatible anyway (the file embeds the exact
+the formats were never cross-version compatible anyway (the file embeds the
-version string).
+exact version string).
 
-What still needs explicit code is exactly what state.c's `rs_fix_thing` did:
+`SaveState` is a flat, pointer-free mirror of the game rather than an embedded
-pointers that alias other structures are encoded as indices —
+`RogueGame` — gob silently drops embedded fields of unexported types, and the
+pointer aliasing has to be flattened anyway. What needs explicit code is exactly
+what state.c's `rs_fix_thing` did: pointers that alias other structures are
+encoded as indices, then re-aliased on load —
 
 ```go
 type SaveState struct {
     Version string
-    Game     RogueGame          // gob-friendly: exported fields
+    // ... the scalar game state, then value-copied worlds:
-    // pointer fixups:
+    Player   savedPlayer      // Body savedCreature + equipment as pack indices
-    CurArmorIdx, CurWeaponIdx int // index into Player.Pack, -1 = nil
+    Places   []savedPlace     // map cells without the monster pointer
-    CurRingIdx  [2]int
+    Objects  []Object
-    MonstDest   []DestRef       // per monster: {Kind: hero|monster|object|gold, Index int}
+    Monsters []savedCreature
-    PlaceMonst  []int           // per map cell: index into Level.Monsters
+    Dests    []destRef        // per monster: {Kind: hero|monster|object|gold, Idx}
+    // rooms, passages, daemons, items, bestiary, screen contents, ...
 }
 ```
 
-Save-file hygiene keeps the C behavior: the file is deleted on restore, and
+Save-file hygiene keeps the C behavior: the file is deleted on restore, and the
-`Run` exits after a successful save. The XOR encryption and symlink checks are
+save command exits the process after a successful write (via `myExit`, §6). The
-dropped (they were 1980s shared-machine anti-cheat).
+XOR encryption and symlink checks are dropped (they were 1980s shared-machine
+anti-cheat).
 
 ### 5.7 Scoreboard
 
@@ -1553,45 +1593,92 @@ Tombstone/victory screens port verbatim from rip.c.
 ## 6. C construct → Go construct map
 
 | C construct                                          | Go translation                                                                                  |
-| ---------------------------------------------------- | -------------------------------------------------------------------------------------- |
+| ---------------------------------------------------- | ----------------------------------------------------------------------------------------------- |
 | global variable                                      | `RogueGame` field (or Player/Level/subsystem field)                                             |
 | file-scope static                                    | unexported field on `RogueGame` or subsystem struct                                             |
 | `THING` union                                        | `Creature` / `Object` structs                                                                   |
 | linked lists (`l_next/l_prev`, attach/detach)        | slices + `attach(&s, x)`-style helpers (prepend, remove by identity)                            |
 | `coord*` aliasing (t_dest)                           | `*Coord` pointers into live structs (kept)                                                      |
-| function pointers (daemons, options, nameit)         | enum IDs + dispatch switch (daemons, save-relevant); closures (options, nameit)        |
+| function pointers (daemons, options, nameit)         | enum IDs → handler tables on `gameData` (daemons + effect dispatch); closures (options, nameit) |
 | `when`/`otherwise`/`until` macros                    | `case`/`default`/`for !cond`                                                                    |
 | `goto` (retry loops in pack.c, move.c, passages.c)   | labeled loops / restructured `for`                                                              |
 | char-indexed tables (`monsters[type-'A']`)           | same, `monsterTable[t.Type-'A']`                                                                |
-| damage strings `"3x4/1x2"`                           | kept as strings; parsed by `rollEm` (`strings`/`strconv`)                              |
+| damage strings `"3x4/1x2"`                           | parsed once into a `DiceSpec` (`[]DiceRoll`) by `ParseDice` at table time                       |
 | curses stdscr/hw windows                             | `Window` cell buffers over tcell                                                                |
 | `mvinch` screen reads                                | `Window.Inch` from the buffer                                                                   |
 | signal handlers (SIGHUP autosave, SIGTSTP, SIGINT)   | `os/signal` goroutine → channel checked in ReadChar; tcell handles TSTP/resize                  |
-| `setjmp`-free exits (`my_exit`, `exit()` everywhere) | error returns from `Run` + a small `gameOver` sentinel; no `os.Exit` inside game logic |
+| `setjmp`-free exits (`my_exit`, `exit()` everywhere) | `myExit` restores the terminal and calls `os.Exit(0)`; one game run is one process              |
 | `vsprintf` message building                          | `fmt.Sprintf`                                                                                   |
 | XOR-encrypted binary saves (state.c)                 | gob snapshot (§5.6)                                                                             |
 | DES wizard password                                  | `ROGUE_WIZARD=1` env check                                                                      |
 | `md_*` platform shims                                | stdlib (`os`, `os/user`, `time`) or deleted                                                     |
 
 **Exit discipline** deserves a note: the C code calls `exit()` from deep inside
-call chains (death, victory, save). The port threads a `g.gameOver(reason)` that
+call chains (death, victory, save). One game run is one process, so the port
-sets `Playing=false` and unwinds via normal returns to `Run` — the one
+does the same — `myExit` restores the terminal (via `Screen.Fini`) and calls
-structural change made everywhere, since `os.Exit` would skip tcell teardown and
+`os.Exit(0)`. `Run` therefore does not return; the game ends by exiting. (An
-defers.
+earlier iteration unwound a `gameEnd` panic recovered in `Run`; step 8 replaced
+it with the direct exit.)
 
 ## 7. Naming conventions
 
-- C function `do_move` → method `(g *RogueGame) DoMove(dy, dx int)`; the C name
+The initial port preserved C names in CamelCase for mechanical
-  is preserved in CamelCase so cross-referencing Part 1 is mechanical.
+cross-referencing. The idiomatic-refactor phase (steps 1–8) then renamed symbols
-  Statics/internal helpers are lowerCamel (`g.doadd` → `g.addMsgV`).
+to descriptive Go names, keeping the C name as a `(file.c func_name)` breadcrumb
-- Entity-intrinsic functions become entity methods where they read no game
+in each doc comment. So `do_move` is `moveHero`, not `DoMove`; `inv_name` is
-  state: `inv_name(obj, drop)` needs ItemLore →
+`inventoryName`; `roll_em` is `rollAttacks`. The notable mappings are tabulated
-  `(g *RogueGame) InvName(o *Object, drop bool) string`; but `is_magic(obj)` →
+in §7.1.
-  `(o *Object) IsMagic() bool`.
+
-- Boolean C `bool`/`int` returns stay `bool`; `char` returns become `byte`.
+- Exported vs. unexported: `RogueGame`, the constructor `New` (taking a `Params`
+  struct), `Run`, `Restore`, and the type/field vocabulary are exported; the
+  ported command and effect methods are unexported (`moveHero`, `quaff`, ...) —
+  they are internals, not API.
+- Entity-intrinsic functions become entity methods where they fit: `find_obj` →
+  `(l *Level) ObjectAt`, pack surgery → `Player` methods, the message machinery
+  → `MessageLine` methods (step 6).
+- Boolean C `bool`/`int` returns become `bool`; the C `-1/0` status codes
+  (`attack`, `move_monst`, `do_chase`) become named `bool` results (step 5).
+  `char` returns become `byte`.
 - `coord*` out-params become `Coord` returns (or `(Coord, bool)` for find-style
   functions like `fallpos`/`find_floor`).
 
+### 7.1 C name → Go name
+
+Renames worth cross-referencing against Part 1 (the full set lives in the
+`(file.c name)` breadcrumbs on each definition):
+
+| C source name              | Go name                                    | Where             |
+| -------------------------- | ------------------------------------------ | ----------------- |
+| `NewGame`/`Config`\*       | `New` / `Params`                           | game.go           |
+| `my_exit`                  | `myExit` (→ `os.Exit`)                     | rip.go            |
+| `do_move`                  | `moveHero`                                 | move.go           |
+| `be_trapped`               | `springTrap`                               | move.go           |
+| `rndmove`                  | `randomStep`                               | move.go           |
+| `do_run`                   | `startRun`                                 | move.go           |
+| `move_stuff`               | `finishMove`                               | move.go           |
+| `chg_str`                  | `changeStrength`                           | misc.go           |
+| `get_dir`                  | `promptDirection`                          | misc.go           |
+| `do_rooms` / `do_maze`     | `digRooms` / `digMaze`                     | rooms.go          |
+| `rnd_room` / `rnd_pos`     | `randomRoom` / `randomPos`                 | rooms.go          |
+| `do_passages` / `conn`     | `digPassages` / `connectRooms`             | passages.go       |
+| `putpass` / `numpass`      | `putPassage` / `numberPassage`             | passages.go       |
+| `roomin` / `cansee`        | `roomIn` / `canSee`                        | chase.go          |
+| `runto` / `move_monst`     | `runTo` / `moveMonster`                    | chase.go          |
+| `do_chase` / `set_oldch`   | `chaseStep` / `setOldChar`                 | chase.go          |
+| `find_obj`                 | `(l *Level).ObjectAt`                      | level.go          |
+| `roll_em`                  | `rollAttacks`                              | fight.go          |
+| `do_pot`                   | `applyPotionFuse`                          | potions.go        |
+| `get_item`                 | `promptPackItem` (→ `(obj, ok)`)           | pack.go           |
+| `inv_name`                 | `inventoryName`                            | things.go         |
+| `struct msg` statics       | `MessageLine`                              | io.go             |
+| `o_type` (byte)            | `Object.Kind` (`ObjectKind`)               | object.go         |
+| `o_arm` (overloaded)       | `ArmorClass`/`Charges`/`GoldValue`/`Bonus` | object.go         |
+| `s_arm`                    | `Stats.ArmorClass`                         | types.go          |
+| `amulet` / `ntraps`        | `HasAmulet` / `Level.TrapCount`            | game.go/level.go  |
+| `ISHUH`/`SEEMONST`/`ISRUN` | `Confused`/`SenseMonsters`/`Awake`         | types.go (step 1) |
+
+\* `Restore` keeps its C name but also takes `Params`.
+
 ## 8. Porting order (each step compiles, is committed, and is testable)
 
 1. **Foundation:** `go.mod`, types.go, object.go, creature.go, level.go, rng.go,
@@ -1609,6 +1696,13 @@ defers.
 7. **Endgame:** rip.go, score.go, save.go, cmd/rogue. Full game loop, save,
    scores.
 
+Once the transliterated port was complete and playable, an **idiomatic-refactor
+phase** followed (one feature branch per step, suite green throughout): typed
+kinds and split `o_arm` fields; descriptive renames and `goto` removal; the
+god-object extraction onto `Player`/`Level`/`MessageLine`; effect-dispatch
+handler tables on `gameData`; the `New(Params)` constructor; and direct process
+exit. Those are the steps referenced above (e.g. "step 5", "step 7").
+
 ## 9. Dropped C functionality (deliberate)
 
 | Dropped                                                            | Why                        | Replacement                 |
@@ -1629,11 +1723,14 @@ defers.
   chars + room/passage metadata) to text fixtures; any diff = a porting bug in
   rooms/passages/newlevel. Fixtures generated once from instrumented C, or
   accepted from the first correct Go run and guarded thereafter.
-- **Combat math tests:** `swing`/`rollEm` against hand-computed cases,
+- **Combat math tests:** `swing`/`rollAttacks` against hand-computed cases,
   str_plus/add_dam table spot checks.
 - **Determinism test:** scripted input sequence against a fixed seed must
   produce identical final state across runs (guards hidden nondeterminism — map
   iteration, time dependence).
-- **Save round-trip:** NewGame → play N scripted turns → save → restore →
+- **Save round-trip:** dirty a game's state, snapshot it to a file, `Restore`,
-  compare full state.
+  and compare — including the pointer fixups (equipment aliasing, monster chase
-- `go vet` + `gofmt` clean at every commit.
+  targets, map monster index). Because game-over now exits the process (step 8),
+  this goes through `saveFile`/`Restore` directly rather than driving the `S`
+  command to completion.
+- `go vet` + `gofmt` + `golangci-lint` clean at every commit.

README.md

@@ -73,8 +73,12 @@ cmd/rogue/   the executable
 ```
 
 The engine package is fully headless-testable: `go test ./game/` runs scripted
-game sessions, dungeon-generation golden checks, and an RNG compatibility test
+command sequences, dungeon-generation golden checks, and an RNG compatibility
-against the original C generator.
+test against the original C generator.
+
+For development, the `Makefile` wraps the toolchain: `make fmt` (gofmt +
+prettier), `make lint` (golangci-lint), `make test`, and `make check` (all
+three).
 
 ## License
 

TODO.md

@@ -29,12 +29,55 @@ Refactor ground rules:
 
 # Next Step
 
-Refactor step 8: constructor and style pass per the house styleguide —
+Broaden unit test coverage where playtesting finds thin spots (rings, sticks,
-game.New(game.Params{...}) replacing NewGame(Config); replace the gameEnd panic
+wizard commands).
-unwind with error-based turn results where feasible; 77-column wrap sweep.
 
 # Completed Steps
 
+- 2026-07-24 Seed compatibility — item tables (seed-compat): instrumented the C
+  reference on modern-rogue with a DUMP mode (testdata/c_seedcompat.patch) that
+  forces the RNG seed and prints the per-seed item appearance tables (potion
+  colors, scroll names, ring stones, wand/staff materials) before initscr, and
+  captured its output for four seeds as testdata/item_tables.golden.
+  TestSeedCompatItemTables regenerates the same tables from the Go port and they
+  match byte for byte — proving the LCG and its consumption order through the
+  whole init sequence agree with C. The remaining "same dungeon (map)" half
+  would need the harder headless-curses C dump (new_level draws to curses);
+  deferred — the item-table match already validates RNG-order faithfulness
+  through init, and the Go generation goldens guard determinism thereafter.
+
+- 2026-07-23 Playtest hardening (playtest-hardening): added two death-safe
+  crash-sweep drives through the real turn loop, within the step-8 os.Exit
+  constraint (a fortify() helper pins HP/food/exp and clears the freeze/stuck
+  counters each turn so no death exits the test binary; fixed seeds keep them
+  deterministic). TestDeepPlaythrough uses quaff/read/zap through command
+  dispatch, then descends to depth 8 with a save/restore at depth 4;
+  TestTurnLoopCrashSweep mashes movement/search/rest for 200 turns on four
+  seeds. Neither surfaced a panic. The interactive "play several games at a real
+  tcell terminal" portion needs a human at an 80x24 terminal and is left to the
+  maintainer; the binary's non-interactive paths (`-s` scores) were
+  smoke-tested.
+
+- 2026-07-23 Docs refresh (docs-refresh): rewrote ARCHITECTURE.md Part 2 (the
+  pre-implementation design sketch) to match the final code — current type/field
+  names (ObjectKind, DiceSpec, split o_arm, step-1 flag names, TrapCount, Level
+  list methods), the static tables now on the per-game gameData struct, the
+  daemon/effect handler tables, the MessageLine extraction, the Terminal
+  interface, the flat gob SaveState, and the New(Params) + os.Exit design. Added
+  §7.1, a C-name → Go-name rename table, and a README note on the make targets.
+
+- 2026-07-23 Refactor step 8 (refactor/constructor-style): constructor and exit
+  pass. NewGame(Config) → New(Params) and Restore takes Params, so the package's
+  primary type gets the canonical New() constructor with a named-field Params
+  struct (styleguide 139/159). The gameEnd panic unwind is gone: one game run is
+  one process, so myExit restores the terminal (new Terminal.Fini) and calls
+  os.Exit(0), and Run() no longer returns; the four Run()-to-completion tests
+  were reworked/dropped since death (combat or starvation) now exits the process
+  (TestScoreRendersList and TestRunDownStairs preserve what is still drivable;
+  save/restore stays covered by TestSaveRestoreRoundTrip). The 77-column wrap
+  sweep was dropped per sneak (2026-07-23): line lengths left as-is (lll caps at
+  88 and passes).
+
 - 2026-07-07 Refactor step 7 (refactor/effects-dispatch): effects dispatch
   tables plus a full decomposition sweep — the quaff / readScroll / doZap
   switches, the attack monster-power switch, the be_trapped switch, the daemon
@@ -133,24 +176,13 @@ unwind with error-based turn results where feasible; 77-column wrap sweep.
 
 # Future Steps
 
-1. Docs refresh: update ARCHITECTURE.md Part 2 and README.md for the
+1. Tag a release once a full game (Amulet retrieval and score entry) completes
-   post-refactor names; add the C name → Go name rename table.
-2. Playtest hardening pass: play several full games with the tcell binary and
-   extend run_test.go to script a deeper multi-level playthrough (descend past
-   level 5, use potions, scrolls, zapping, save/restore). Fix any panics,
-   message mismatches, or divergences from the C behavior that this uncovers,
-   with regression tests.
-3. Verify the seed-compatibility claim against the C reference on c-master: same
-   seed, same dungeon, same item tables, for several seeds.
-4. Broaden unit test coverage where playtesting finds thin spots (rings, sticks,
-   wizard commands).
-5. Tag a release once a full game (Amulet retrieval and score entry) completes
    without defects.
-6. Full-terminal-size support (deferred by explicit decision 2026-07-06):
+2. Full-terminal-size support (deferred by explicit decision 2026-07-06):
    per-game dungeon dimensions instead of the 80x24 constants; open design
    questions are resize policy, gameplay tuning at larger sizes, and a --classic
    80x24 mode.
-7. Note: this repo is exempt from the standard policy scaffold. A minimal dev
+3. Note: this repo is exempt from the standard policy scaffold. A minimal dev
    Makefile (fmt/fmt-check/lint/test/check targets) exists per sneak's
    2026-07-07 request, but do not add a Dockerfile, CI config, or
    REPO_POLICIES.md.

cmd/rogue/main.go

@@ -21,18 +21,20 @@ func main() {
 	os.Exit(run())
 }
 
-// run carries the real main so that deferred terminal restoration runs
+// run does the real work and returns an exit code. It only returns on a
-// before the process exits (os.Exit skips defers).
+// startup error; once the game starts, it ends by exiting the process
+// from within (game.myExit restores the terminal first). The deferred
+// Fini covers the early-return paths.
 func run() int {
 	scores := flag.Bool("s", false, "print the scoreboard and exit")
 	deathDemo := flag.Bool("d", false, "die a random death (demo)")
 
 	flag.Parse()
 
-	cfg := loadConfig()
+	params := loadParams()
 
 	if *scores {
-		game.NewGame(cfg).ShowScores()
+		game.New(params).ShowScores()
 
 		return 0
 	}
@@ -45,46 +47,39 @@ func run() int {
 	}
 	defer t.Fini()
 
-	cfg.Term = t
+	params.Term = t
 
 	var g *game.RogueGame
 
 	if args := flag.Args(); len(args) == 1 && !*deathDemo {
 		// restore a saved game
-		g, err = game.Restore(args[0], cfg)
+		g, err = game.Restore(args[0], params)
 		if err != nil {
-			t.Fini()
+			fmt.Fprintln(os.Stderr, err) // deferred Fini restores the terminal
-			fmt.Fprintln(os.Stderr, err)
 
 			return 1
 		}
 	} else {
-		g = game.NewGame(cfg)
+		g = game.New(params)
 	}
 
 	if *deathDemo {
-		g.DeathDemo()
+		g.DeathDemo() // does not return: death exits the process
 
 		return 0
 	}
 
 	installAutosave(g, t)
 
-	runErr := g.Run()
+	g.Run() // does not return: the game ends by exiting the process
-	if runErr != nil {
-		t.Fini()
-		fmt.Fprintln(os.Stderr, runErr)
-
-		return 1
-	}
 
 	return 0
 }
 
-// loadConfig gathers the game configuration from the environment: home
+// loadParams gathers the game parameters from the environment: home
 // directory, ROGUEOPTS, user name, wizard mode, and the dungeon seed
 // (main.c's startup).
-func loadConfig() game.Config {
+func loadParams() game.Params {
 	home, _ := os.UserHomeDir()
 
 	name := ""
@@ -96,7 +91,7 @@ func loadConfig() game.Config {
 
 	wizard := os.Getenv("ROGUE_WIZARD") != ""
 
-	return game.Config{
+	return game.Params{
 		Seed:      chooseSeed(wizard),
 		Name:      name,
 		RogueOpts: os.Getenv("ROGUEOPTS"),

game/effects_test.go

@@ -7,7 +7,7 @@ import "testing"
 func mkGameInput(t *testing.T) *RogueGame {
 	t.Helper()
 
-	g := NewGame(Config{Seed: 5, Term: &testTerm{}})
+	g := New(Params{Seed: 5, Term: &testTerm{}})
 	g.NewLevel()
 	g.Oldpos = g.Player.Pos
 	g.Oldrp = g.roomIn(g.Player.Pos)
@@ -183,7 +183,7 @@ func TestZapSlowMonster(t *testing.T) {
 }
 
 func TestParseOpts(t *testing.T) {
-	g := NewGame(Config{Seed: 1})
+	g := New(Params{Seed: 1})
 	g.ParseOpts("terse,nojump,name=Conan,fruit=mango,inven=slow")
 
 	if !g.Options.Terse {

game/fight_test.go

@@ -7,7 +7,7 @@ import "testing"
 func mkGame(t *testing.T, seed int32) *RogueGame {
 	t.Helper()
 
-	g := NewGame(Config{Seed: seed, Term: &testTerm{}})
+	g := New(Params{Seed: seed, Term: &testTerm{}})
 	g.NewLevel()
 	g.Oldpos = g.Player.Pos
 	g.Oldrp = g.roomIn(g.Player.Pos)
@@ -79,24 +79,6 @@ func TestAttackHurtsPlayer(t *testing.T) {
 	}
 }
 
-func TestDeathUnwindsWithGameEnd(t *testing.T) {
-	g := mkGame(t, 11)
-
-	defer func() {
-		r := recover()
-		if _, ok := r.(gameEnd); !ok {
-			t.Fatalf("death did not unwind with gameEnd, got %v", r)
-		}
-
-		if g.Playing {
-			t.Error("still playing after death")
-		}
-	}()
-
-	g.Options.Tombstone = false
-	g.death('K')
-}
-
 func TestRunnersChaseHero(t *testing.T) {
 	g := mkGame(t, 3)
 	// Place a hobgoblin a few squares away in the hero's room and set it

game/game.go

@@ -31,9 +31,9 @@ type Options struct {
 	InvType    int  // inven: inventory style (InvOver/InvSlow/InvClear)
 }
 
-// Config carries everything needed to construct a game.
+// Params carries everything needed to construct a game.
-type Config struct {
+type Params struct {
-	Seed      int32    // dungeon number; the caller derives it (time+pid or SEED env)
+	Seed      int32    // dungeon number; caller derives it (time+pid or SEED)
 	Name      string   // player name (overridden by ROGUEOPTS name=)
 	RogueOpts string   // the ROGUEOPTS environment string
 	Home      string   // home directory (save file default location)
@@ -44,7 +44,7 @@ type Config struct {
 
 // RogueGame is one complete game of Rogue: every piece of state that was a
 // global (or file-scope static) in the C sources, plus the terminal it is
-// played on. Construct with NewGame, then call Run.
+// played on. Construct with New, then call Run.
 //
 // The struct grows with the port; fields appear in the phase that ports the
 // code owning them.
@@ -143,22 +143,22 @@ type RogueGame struct {
 	data *gameData
 }
 
-// NewGame builds a game from cfg, seeds the RNG, and randomizes the item
+// New builds a game from params, seeds the RNG, and randomizes the item
 // appearance tables (the front half of main.c main(); the player roll-up
 // and first level arrive with later porting phases).
-func NewGame(cfg Config) *RogueGame {
+func New(params Params) *RogueGame {
 	g := &RogueGame{
 		data:      newGameData(),
-		Rng:       &Rng{Seed: cfg.Seed},
+		Rng:       &Rng{Seed: params.Seed},
-		Dnum:      int(cfg.Seed),
+		Dnum:      int(params.Seed),
-		Whoami:    cfg.Name,
+		Whoami:    params.Name,
 		Fruit:     "slime-mold",
-		Home:      cfg.Home,
+		Home:      params.Home,
-		Wizard:    cfg.Wizard,
+		Wizard:    params.Wizard,
-		NoScore:   cfg.Wizard,
+		NoScore:   params.Wizard,
 		Playing:   true,
 		Depth:     1,
-		ScorePath: cfg.ScorePath,
+		ScorePath: params.ScorePath,
 		LastScore: -1,
 	}
 	g.Options = Options{
@@ -168,17 +168,17 @@ func NewGame(cfg Config) *RogueGame {
 	}
 	g.InvDescribe = true
 	g.Msgs.SaveMsg = true
-	g.scr = NewScreen(cfg.Term)
+	g.scr = NewScreen(params.Term)
 	g.Msgs.attach(g.scr, g.look, g.readchar)
-	g.FileName = cfg.Home + "/rogue.save"
+	g.FileName = params.Home + "/rogue.save"
 
-	g.rogueOpts = cfg.RogueOpts
+	g.rogueOpts = params.RogueOpts
-	if cfg.Wizard {
+	if params.Wizard {
 		g.Player.Flags.Set(SenseMonsters)
 	}
 
-	if cfg.RogueOpts != "" {
+	if params.RogueOpts != "" {
-		g.ParseOpts(cfg.RogueOpts)
+		g.ParseOpts(params.RogueOpts)
 	}
 
 	g.Monsters = g.data.monsterTable
@@ -199,37 +199,45 @@ func NewGame(cfg Config) *RogueGame {
 }
 
 // Run plays the game to its end: the back half of main.c main() plus
-// playit(). It returns after death, victory, quitting, or saving.
+// playit(). It does not return — the game ends by exiting the process
-func (g *RogueGame) Run() error {
+// (see myExit); one game run is one process.
-	// A gameEnd panic is the port's my_exit(): recovering it here makes
+func (g *RogueGame) Run() {
-	// Run return normally (zero values), restoring the terminal via the
+	g.startLevel()
-	// caller's defers.
+	g.playit()
-	defer func() {
+}
-		if r := recover(); r != nil {
+
-			if _, ok := r.(gameEnd); ok {
+// startLevel draws the first level and starts the standing daemons and
-				return // normal game over / save exit
+// fuses for a fresh game; a restored game brings its own (the back half
+// of main.c main()).
+func (g *RogueGame) startLevel() {
+	if g.restored {
+		return
 	}
 
-			panic(r)
-		}
-	}()
-
-	if !g.restored {
 	g.NewLevel() // draw current level
 	// Start up daemons and fuses
 	g.StartDaemon(DRunners, 0, After)
 	g.StartDaemon(DDoctor, 0, After)
 	g.Fuse(DSwander, 0, wanderTime(g), After)
 	g.StartDaemon(DStomach, 0, After)
-	}
-
-	g.playit()
-
-	return nil
 }
 
 // playit is the main loop of the program (main.c playit).
 func (g *RogueGame) playit() {
+	g.prePlay()
+
+	for g.Playing {
+		g.command() // command execution
+	}
+
+	g.endit()
+}
+
+// prePlay does the option and position setup at the top of playit,
+// before the command loop (main.c playit). It is split out so tests can
+// drive a bounded number of turns; the loop itself never returns,
+// because game-over exits the process.
+func (g *RogueGame) prePlay() {
 	// set up defaults for modern terminals: curses' md_hasclreol() is
 	// always true, so the C default inventory style applies
 	if !g.restored {
@@ -242,13 +250,7 @@ func (g *RogueGame) playit() {
 	}
 
 	g.Oldpos = g.Player.Pos
-
 	g.Oldrp = g.roomIn(g.Player.Pos)
-	for g.Playing {
-		g.command() // command execution
-	}
-
-	g.endit()
 }
 
 // endit exits the game (main.c endit).

game/newlevel_test.go

@@ -8,7 +8,7 @@ import (
 func genLevel(t *testing.T, seed int32) *RogueGame {
 	t.Helper()
 
-	g := NewGame(Config{Seed: seed})
+	g := New(Params{Seed: seed})
 	g.NewLevel()
 
 	return g
@@ -159,7 +159,7 @@ func TestNewLevelDeterministic(t *testing.T) {
 // mazes, dark rooms, traps, treasure rooms — as a crash/invariant sweep.
 func TestDeeperLevels(t *testing.T) {
 	for _, seed := range []int32{7, 42, 1000, 31337} {
-		g := NewGame(Config{Seed: seed})
+		g := New(Params{Seed: seed})
 		for depth := 1; depth <= 30; depth++ {
 			g.Depth = depth
 			g.NewLevel()

game/rip.go

@@ -2,23 +2,20 @@ package game
 
 import (
 	"fmt"
+	"os"
 	"time"
 )
 
 // rip.c — the fun ends: death or a total win.
 //
-// The C functions here call exit(); the port panics with a gameEnd sentinel
+// The C functions here call exit(). One game run is one process, so the
-// that Run recovers, so the terminal is restored by normal unwinding.
+// port does the same: myExit restores the terminal and exits directly.
 
-// gameEnd is the sentinel carried by the panic that replaces my_exit().
+// myExit leaves the process properly (main.c my_exit): it restores the
-type gameEnd struct{}
+// terminal and ends the process. Every C caller exited with status 0.
-
-// myExit leaves the process properly (main.c my_exit): it unwinds to Run.
-// Every C caller exited with status 0; abnormal exits panic for real.
 func (g *RogueGame) myExit() {
-	g.Playing = false
+	g.scr.Fini()
-
+	os.Exit(0)
-	panic(gameEnd{})
 }
 
 // death does something really fun when he dies (rip.c death).
@@ -255,18 +252,9 @@ func (g *RogueGame) killname(monst byte, doart bool) string {
 }
 
 // DeathDemo implements the -d command line option (main.c): burn some
-// random numbers to break patterns, then die a random death.
+// random numbers to break patterns, then die a random death. It does not
+// return — death exits the process.
 func (g *RogueGame) DeathDemo() {
-	defer func() {
-		if r := recover(); r != nil {
-			if _, ok := r.(gameEnd); ok {
-				return
-			}
-
-			panic(r)
-		}
-	}()
-
 	dnum := g.rnd(100)
 	for dnum--; dnum > 0; dnum-- {
 		g.rnd(100)

game/run_test.go

@@ -1,27 +1,75 @@
 package game
 
 import (
+	"path/filepath"
 	"strings"
 	"testing"
 )
 
-// TestRunScriptedSession drives a complete game through Run(): a few
+// fortify makes the hero effectively immortal for a crash-sweep drive:
-// moves, a rest, an inventory, then Q-quit answered yes.
+// game-over now calls myExit and os.Exit(0) (step 8), which would kill the
-func TestRunScriptedSession(t *testing.T) {
+// test binary, so every death vector is neutralized. Re-applied each turn
-	tt := &testTerm{input: []byte("hjkl.i Qy")}
+// because combat, digestion, freezing, and level drain chip away at these.
+func fortify(g *RogueGame) {
+	p := &g.Player
+	p.Stats.HP = 30000    // survive combat, arrow/dart traps, bolts
+	p.Stats.MaxHP = 30000 // survive vampire max-hp drain
+	p.Stats.Exp = 30000   // survive wraith level drain (death when exp hits 0)
+	p.FoodLeft = 30000    // never starve
+	g.NoCommand = 0       // never freeze to death (ice monster / sleep trap)
+	g.NoMove = 0          // never stay stuck in a bear trap
+}
 
-	g := NewGame(Config{Seed: 99, Term: tt})
+// driveTurns runs the game's per-turn loop up to n times, doing the same
+// first-level and pre-play setup Run() does. Run() itself no longer
+// returns — game-over exits the process — so tests drive command()
+// directly, with short scripts that avoid quitting, saving, or playing
+// long enough to starve, any of which would exit the test binary.
+func driveTurns(t *testing.T, g *RogueGame, n int) {
+	t.Helper()
 
-	err := g.Run()
+	g.startLevel()
-	if err != nil {
+	g.prePlay()
-		t.Fatalf("Run: %v", err)
+
+	for range n {
+		g.command()
 	}
+}
 
-	if g.Playing {
+// TestRunDownStairs stands the hero on the staircase and descends via the
-		t.Error("still playing after quit")
+// '>' command through the real turn loop, then checks the level changed.
+func TestRunDownStairs(t *testing.T) {
+	// '>' is a free action (After=false), so it is followed by a paying
+	// rest ('.') to end the command() call; without a paying action the
+	// turn loop would spin forever on the auto-fed prompt input.
+	tt := &testTerm{input: []byte(">.")}
+	g := New(Params{Seed: 7, Term: tt})
+	g.NewLevel()
+	g.Player.Pos = g.Level.Stairs // stand on the stairs
+	g.restored = true             // keep startLevel from regenerating
+	g.Daemons = DaemonList{}      // and give it a fresh daemon table
+	g.StartDaemon(DRunners, 0, After)
+	g.StartDaemon(DDoctor, 0, After)
+	g.Fuse(DSwander, 0, wanderTime(g), After)
+	g.StartDaemon(DStomach, 0, After)
+
+	driveTurns(t, g, 1)
+
+	if g.Depth != 2 {
+		t.Errorf("depth = %d after descending, want 2", g.Depth)
 	}
-	// After quitting, the scoreboard is the last thing shown (in C it went
+}
-	// to stdout after endwin; here it is drawn on the screen).
+
+// TestScoreRendersList checks that the scoreboard is drawn on the screen
+// (in C it went to stdout after endwin; here it stays on the screen). The
+// quit and death paths that normally show it now exit the process, so the
+// display is exercised through score() directly.
+func TestScoreRendersList(t *testing.T) {
+	g := New(Params{Seed: 1, Term: &testTerm{}})
+	g.Player.Purse = 100
+
+	g.score(g.Player.Purse, 1, 0) // flags 1 = quit; posts the top-ten list
+
 	found := false
 
 	for y := range NumLines {
@@ -31,96 +79,126 @@ func TestRunScriptedSession(t *testing.T) {
 	}
 
 	if !found {
-		t.Error("score list not on screen after quit")
+		t.Error("score list not on screen")
 	}
 }
 
-// TestRunManyTurns mashes movement keys for a while as a crash sweep of
+// TestDeepPlaythrough drives a fortified hero through the real command loop:
-// the whole turn loop (daemons, hunger, monsters, combat), ending with a
+// quaff/read/zap on the first level, then descend through the staircase to
-// quit. The input alternates directions so the hero bumps around rooms.
+// depth 8, saving and restoring mid-way. It is a crash sweep of the turn
-func TestRunManyTurns(t *testing.T) {
+// engine, deep level generation, item effects, and mid-game save/restore.
-	// Spaces between commands double as answers to any --More-- prompts;
+// The hero is fortified so no death exits the process (step 8), and the fixed
-	// without them a single prompt would swallow the rest of the script
+// seed keeps it deterministic.
-	// (wait_for eats everything that isn't a space).
+func TestDeepPlaythrough(t *testing.T) {
-	moves := []byte("h j k l y u b n s .")
+	g := New(Params{Seed: 4242, Wizard: true, Term: &testTerm{}})
-	script := make([]byte, 0, len(moves)*200+7)
+	g.startLevel()
+	g.prePlay()
+	fortify(g)
+
+	// Stock and use one of each consumable through the command dispatch.
+	pot := give(g, &Object{Kind: KindPotion, Which: int(PotionHealing)})
+	scr := give(g, &Object{Kind: KindScroll, Which: int(ScrollMagicMapping)})
+
+	wand := newObject()
+	wand.Kind = KindWand
+	wand.Which = int(WandLight)
+	wand.Charges = 5
+	zap := give(g, wand)
+
+	setInput(t, g, 'q', pot) // quaff healing
+	g.command()
+	setInput(t, g, 'r', scr) // read magic mapping
+	g.command()
+	setInput(t, g, 'z', 'h', zap) // zap the light wand west
+	g.command()
+	fortify(g)
+
+	// Each consumable identifies itself on use, confirming the q/r/z
+	// commands actually ran through dispatch (not aborted on a bad prompt).
+	if !g.Items.Potions[PotionHealing].Know {
+		t.Error("quaff command did not identify the healing potion")
+	}
+
+	if !g.Items.Scrolls[ScrollMagicMapping].Know {
+		t.Error("read command did not identify the magic-mapping scroll")
+	}
+
+	if !g.Items.Sticks[WandLight].Know {
+		t.Error("zap command did not identify the light wand")
+	}
+
+	const wantDepth = 8
+
+	for g.Depth < wantDepth {
+		g.Player.Pos = g.Level.Stairs // stand on the stairs
+		setInput(t, g, '>', '.')      // '>' descends (free), '.' pays the turn
+		g.command()
+		fortify(g)
+
+		if g.Depth == 4 {
+			g = saveAndRestore(t, g)
+			fortify(g)
+		}
+	}
+
+	if g.Depth != wantDepth {
+		t.Errorf("depth = %d after descending, want %d", g.Depth, wantDepth)
+	}
+
+	if g.Player.Stats.HP <= 0 {
+		t.Error("hero died during the playthrough")
+	}
+}
+
+// TestTurnLoopCrashSweep mashes movement, search, and rest through the real
+// turn loop for many turns on several seeds, exercising combat, monster AI,
+// and traps. The hero is fortified each turn so nothing exits the process,
+// and the fixed seeds keep it deterministic; the point is to surface panics.
+func TestTurnLoopCrashSweep(t *testing.T) {
+	// A generous mix of movement, search, and rest. The spaces between
+	// commands double as answers to any --More-- prompt (wait_for eats
+	// everything up to a space); without them one prompt would swallow the
+	// rest of the script. The script is long enough that the bounded drive
+	// never exhausts it (which would spin on the auto-fed prompt input).
+	script := []byte(strings.Repeat("h j k l y u b n s . ", 400))
+
+	for _, seed := range []int32{1, 99, 2026, 31337} {
+		g := New(Params{Seed: seed, Term: &testTerm{input: script}})
+		g.startLevel()
+		g.prePlay()
 
 		for range 200 {
-		script = append(script, moves...)
+			fortify(g)
+			g.command()
 		}
 
-	script = append(script, " Q y Qy"...)
+		if g.Player.Stats.HP <= 0 {
-	tt := &testTerm{input: script}
+			t.Errorf("seed %d: hero died despite fortify", seed)
-
-	g := NewGame(Config{Seed: 31337, Term: tt})
-
-	err := g.Run()
-	if err != nil {
-		t.Fatalf("Run: %v", err)
 		}
-
-	if g.Playing {
-		t.Error("session did not end")
 	}
 }
 
-// TestRunDownStairs walks the hero onto the stairs by teleporting there in
+// saveAndRestore snapshots the game to a file, restores it, checks the key
-// wizard style, then descends and keeps playing.
+// state survived, and returns the restored game ready to keep playing.
-func TestRunDownStairs(t *testing.T) {
+func saveAndRestore(t *testing.T, g *RogueGame) *RogueGame {
-	tt := &testTerm{input: []byte(">..Qy")}
+	t.Helper()
-	g := NewGame(Config{Seed: 7, Term: tt})
-	g.NewLevel()
-	g.Player.Pos = g.Level.Stairs // stand on the stairs
-	g.restored = true             // keep Run from regenerating the level
-	g.Daemons = DaemonList{}      // and give it a fresh daemon table
-	g.StartDaemon(DRunners, 0, After)
-	g.StartDaemon(DDoctor, 0, After)
-	g.Fuse(DSwander, 0, wanderTime(g), After)
-	g.StartDaemon(DStomach, 0, After)
 
-	err := g.Run()
+	path := filepath.Join(t.TempDir(), "deep.save")
-	if err != nil {
+
-		t.Fatalf("Run: %v", err)
+	saveErr := g.saveFile(path)
+	if saveErr != nil {
+		t.Fatalf("saveFile: %v", saveErr)
 	}
 
-	if g.Depth != 2 {
+	h, err := Restore(path, Params{Wizard: true, Term: &testTerm{}})
-		t.Errorf("depth = %d after descending, want 2", g.Depth)
-	}
-}
-
-// TestSaveCommandRoundTrip saves via the 'S' command (as a player would)
-// and restores the game.
-func TestSaveCommandRoundTrip(t *testing.T) {
-	// The C get_str caps input at MAXINP=50 characters, so the save path
-	// must be short: work from the temp directory.
-	t.Chdir(t.TempDir())
-
-	path := "cmd.save"
-	// 'S' with no default file name goes straight to the name prompt.
-	script := "S" + path + "\n"
-	tt := &testTerm{input: []byte(script)}
-	g := NewGame(Config{Seed: 55, Term: tt})
-
-	g.FileName = "" // force the name prompt
-
-	runErr := g.Run()
-	if runErr != nil {
-		t.Fatalf("Run: %v", runErr)
-	}
-
-	h, err := Restore(path, Config{Term: &testTerm{}})
 	if err != nil {
 		t.Fatalf("Restore: %v", err)
 	}
 
 	if h.Depth != g.Depth || h.Player.Purse != g.Player.Purse {
-		t.Error("restored game does not match saved game")
+		t.Errorf("restored game diverged: depth %d/%d purse %d/%d",
+			h.Depth, g.Depth, h.Player.Purse, g.Player.Purse)
 	}
-	// The restored game must be playable.
-	setInput(t, h, []byte("..Qy")...)
 
-	restoredErr := h.Run()
+	return h
-	if restoredErr != nil {
-		t.Fatalf("restored Run: %v", restoredErr)
-	}
 }

game/save.go

@@ -681,7 +681,7 @@ var ErrSaveOutOfDate = errors.New("sorry, saved game is out of date")
 
 // Restore restores a saved game from a file (save.c restore). The file is
 // deleted, as in C, to defeat restarting from the same save.
-func Restore(path string, cfg Config) (*RogueGame, error) {
+func Restore(path string, params Params) (*RogueGame, error) {
 	f, err := os.Open(path) //nolint:gosec // G304: the save path is user-chosen by design
 	if err != nil {
 		return nil, err
@@ -704,12 +704,12 @@ func Restore(path string, cfg Config) (*RogueGame, error) {
 		data:      newGameData(),
 		Rng:       &Rng{},
 		Playing:   true,
-		ScorePath: cfg.ScorePath,
+		ScorePath: params.ScorePath,
 		FileName:  path,
-		rogueOpts: cfg.RogueOpts,
+		rogueOpts: params.RogueOpts,
 		restored:  true,
 	}
-	g.scr = NewScreen(cfg.Term)
+	g.scr = NewScreen(params.Term)
 	g.Msgs.attach(g.scr, g.look, g.readchar)
 	g.applySnapshot(&st)
 

game/save_test.go

@@ -29,7 +29,7 @@ func TestSaveRestoreRoundTrip(t *testing.T) {
 		t.Fatalf("saveFile: %v", saveErr)
 	}
 
-	h, err := Restore(path, Config{Term: &testTerm{}})
+	h, err := Restore(path, Params{Term: &testTerm{}})
 	if err != nil {
 		t.Fatalf("Restore: %v", err)
 	}
@@ -154,7 +154,7 @@ func TestRestoreRejectsWrongVersion(t *testing.T) {
 		t.Fatal(closeErr)
 	}
 
-	_, restoreErr := Restore(path, Config{})
+	_, restoreErr := Restore(path, Params{})
 	if restoreErr == nil {
 		t.Error("restore accepted an out-of-date save")
 	}

game/screen.go

@@ -16,6 +16,9 @@ type Terminal interface {
 	// ReadChar blocks for the next key, translated to Rogue's input bytes
 	// (arrows become hjkl, control keys their C0 codes).
 	ReadChar() byte
+	// Fini restores the device to its pre-game state (curses endwin). The
+	// game calls it on its way out, since one game run is one process.
+	Fini()
 }
 
 // cell is one screen position.
@@ -213,6 +216,13 @@ func (s *Screen) Refresh() {
 	}
 }
 
+// Fini restores the terminal device, if there is one (curses endwin).
+func (s *Screen) Fini() {
+	if s.term != nil {
+		s.term.Fini()
+	}
+}
+
 // RefreshWin pushes an arbitrary window to the device (curses wrefresh).
 func (s *Screen) RefreshWin(w *Window) {
 	if s.term != nil {

game/seedcompat_test.go

@@ -0,0 +1,98 @@
+package game
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"testing"
+)
+
+// dumpItemTables formats a game's per-seed item appearance tables in the
+// same layout the instrumented C reference prints: the potion colors,
+// scroll names, ring stones, and wand/staff materials, each generated by
+// consuming the RNG in a fixed order during New().
+func dumpItemTables(seed int32, g *RogueGame) string {
+	var b strings.Builder
+
+	fmt.Fprintf(&b, "SEED %d\n", seed)
+
+	fmt.Fprintln(&b, "POTIONS")
+
+	for _, c := range g.Items.PotColors {
+		fmt.Fprintln(&b, c)
+	}
+
+	fmt.Fprintln(&b, "SCROLLS")
+
+	for _, s := range g.Items.ScrNames {
+		fmt.Fprintln(&b, s)
+	}
+
+	fmt.Fprintln(&b, "RINGS")
+
+	for _, s := range g.Items.RingStones {
+		fmt.Fprintln(&b, s)
+	}
+
+	fmt.Fprintln(&b, "STICKS")
+
+	for i := range g.Items.WandType {
+		fmt.Fprintf(&b, "%s %s\n", g.Items.WandType[i], g.Items.WandMade[i])
+	}
+
+	return b.String()
+}
+
+// TestSeedCompatItemTables proves the port's seed-compatibility claim: for
+// the same seed, the Go game generates the exact per-seed item appearance
+// tables as the C reference on modern-rogue. That requires the LCG and its
+// consumption order through the whole init sequence (init_probs →
+// init_player → init_names → init_colors → init_stones → init_materials) to
+// match C byte for byte. The golden is captured from an instrumented build
+// of the C game (testdata/README.md).
+func TestSeedCompatItemTables(t *testing.T) {
+	golden, err := os.ReadFile("testdata/item_tables.golden")
+	if err != nil {
+		t.Fatalf("read golden: %v", err)
+	}
+
+	// These must match the seeds the golden was generated from
+	// (testdata/README.md).
+	seeds := []int32{1, 42, 12345, 99999}
+
+	var got strings.Builder
+
+	for _, seed := range seeds {
+		g := New(Params{Seed: seed, Wizard: true})
+		got.WriteString(dumpItemTables(seed, g))
+	}
+
+	if got.String() != string(golden) {
+		t.Errorf("Go item tables diverge from the C reference at %s",
+			firstDiff(string(golden), got.String()))
+	}
+}
+
+// firstDiff returns a description of the first line where want and got
+// differ, for a readable failure.
+func firstDiff(want, got string) string {
+	wl := strings.Split(want, "\n")
+	gl := strings.Split(got, "\n")
+
+	for i := 0; i < len(wl) || i < len(gl); i++ {
+		w, g := "", ""
+		if i < len(wl) {
+			w = wl[i]
+		}
+
+		if i < len(gl) {
+			g = gl[i]
+		}
+
+		if w != g {
+			return fmt.Sprintf("line %d: C=%q Go=%q", i+1, w, g)
+		}
+	}
+
+	return "no line difference (trailing content?)"
+}

game/tables_test.go

@@ -32,7 +32,7 @@ func TestProbabilitiesSumTo100(t *testing.T) {
 }
 
 func TestInitProbsCumulative(t *testing.T) {
-	g := NewGame(Config{Seed: 1})
+	g := New(Params{Seed: 1})
 
 	last := g.Items.Potions[NumPotionTypes-1].Prob
 	if last != 100 {
@@ -47,14 +47,14 @@ func TestInitProbsCumulative(t *testing.T) {
 }
 
 func TestNewGameRandomizesAppearances(t *testing.T) {
-	g := NewGame(Config{Seed: 12345})
+	g := New(Params{Seed: 12345})
 
 	checkPotionColors(t, g)
 	checkScrollNames(t, g)
 	checkWandMaterials(t, g)
 
 	// Determinism: same seed, same appearances.
-	h := NewGame(Config{Seed: 12345})
+	h := New(Params{Seed: 12345})
 	if h.Items != g.Items {
 		t.Error("two games with the same seed produced different item lore")
 	}

game/term_test.go

@@ -11,6 +11,8 @@ type testTerm struct {
 
 func (t *testTerm) Render(*Window) {}
 
+func (t *testTerm) Fini() {}
+
 func (t *testTerm) ReadChar() byte {
 	if t.pos < len(t.input) {
 		c := t.input[t.pos]

game/testdata/README.md

@@ -0,0 +1,27 @@
+# Seed-compatibility golden
+
+`item_tables.golden` is the per-seed item appearance tables (potion colors,
+scroll names, ring stones, wand/staff materials) captured from the **C
+reference** on the `modern-rogue` branch, for the seeds in the `seeds` list in
+`TestSeedCompatItemTables`. That test regenerates the same tables from the Go
+port and checks they match byte for byte — proving the LCG and its consumption
+order through the whole init sequence (`init_probs` → `init_player` →
+`init_names` → `init_colors` → `init_stones` → `init_materials`) agree with C.
+
+## Regenerating the golden
+
+`c_seedcompat.patch` adds a `DUMP` mode to the C `main.c`: with `DUMP` set it
+forces the RNG seed from `SEED`, runs the item-table init in the normal order,
+prints the tables, and exits before `initscr` (so no terminal is needed).
+
+```sh
+# from a checkout of the C reference (modern-rogue branch):
+git archive modern-rogue | tar -x -C /tmp/rogue-c
+cd /tmp/rogue-c
+patch -p1 < .../game/testdata/c_seedcompat.patch
+./configure && make
+for s in 1 42 12345 99999; do DUMP=1 SEED=$s ./rogue; done \
+    > .../game/testdata/item_tables.golden
+```
+
+The seed list must match the `seeds` slice in `TestSeedCompatItemTables`.

game/testdata/c_seedcompat.patch

@@ -0,0 +1,37 @@
+--- a/main.c	2026-07-24 03:02:38
++++ b/main.c	2026-07-24 02:48:31
+@@ -63,6 +63,34 @@
+ #endif
+ 	dnum = lowtime + md_getpid();
+     seed = dnum;
++
++    /* SEEDCOMPAT: dump the per-game item appearance tables for a fixed
++     * seed and exit, without initscr. The init sequence and everything
++     * it consumes from rnd() mirror the normal startup (main.c), so the
++     * tables are exactly what a real game with SEED would show. */
++    if (getenv("DUMP") != NULL)
++    {
++	int di;
++	char *sv = getenv("SEED");
++	if (sv != NULL)
++	    seed = atoi(sv);
++	printf("SEED %d\n", seed);
++	init_probs();
++	init_player();
++	init_names();
++	init_colors();
++	init_stones();
++	init_materials();
++	printf("POTIONS\n");
++	for (di = 0; di < MAXPOTIONS; di++) printf("%s\n", p_colors[di]);
++	printf("SCROLLS\n");
++	for (di = 0; di < MAXSCROLLS; di++) printf("%s\n", s_names[di]);
++	printf("RINGS\n");
++	for (di = 0; di < MAXRINGS; di++) printf("%s\n", r_stones[di]);
++	printf("STICKS\n");
++	for (di = 0; di < MAXSTICKS; di++) printf("%s %s\n", ws_type[di], ws_made[di]);
++	exit(0);
++    }
+ 
+     open_score();
+ 

game/testdata/item_tables.golden

@@ -0,0 +1,260 @@
+SEED 1
+POTIONS
+tangerine
+white
+ecru
+gold
+amber
+violet
+vermilion
+pink
+aquamarine
+plaid
+clear
+orange
+cyan
+tan
+SCROLLS
+miwhon garsnanih
+xomimi roke eshwedshu
+potwexrol ipbjorod turs evsnelg
+bekornan oxyfatox
+iv wexpo wun
+ha sefnelgtue whon pay
+alari wedit
+zantmon umzonski umwhonjo yot
+bluoxun rokkho yottrol sta
+vomarg microgcomp iteulkshu mung
+jo urokeep yuskiun
+ox xozantaks klisstaevs ag
+ipnih bek
+shu ami erk
+nejti zim
+iprol mic ishoxyvom fagan
+reacreti oodrol
+bytsri solsa tabu fri
+RINGS
+agate
+zircon
+jade
+tiger eye
+onyx
+germanium
+lapis lazuli
+emerald
+taaffeite
+kryptonite
+garnet
+ruby
+turquoise
+pearl
+STICKS
+wand steel
+wand platinum
+staff redwood
+staff pine
+wand silicon
+staff spruce
+staff pecan
+wand bone
+staff maple
+wand zinc
+wand iron
+wand pewter
+wand electrum
+staff dogwood
+SEED 42
+POTIONS
+blue
+green
+grey
+amber
+violet
+gold
+pink
+tan
+purple
+yellow
+plaid
+magenta
+turquoise
+cyan
+SCROLLS
+bek itod oxytaod oxy
+tarhovzant cre sname oxroy
+plemik ganod hyd wergerkpot
+hyd sol um bekzok
+esh eep ganmung
+anera ishsa ingala mon
+alasniklech viv
+yunejorn garro con nej
+dotrolther gopum eltitrol trolmonsri
+nes alazum
+itegopmung ti
+ere haeta wergla
+nejerecre poipi iprea
+ha falechrhov
+monskiwex sabitla frido
+rhovmar sno
+mar bekurzant satbuzum
+somon sri
+RINGS
+carnelian
+onyx
+jade
+granite
+stibotantalite
+kryptonite
+lapis lazuli
+germanium
+garnet
+tiger eye
+opal
+topaz
+agate
+peridot
+STICKS
+staff birch
+staff ebony
+staff redwood
+wand gold
+wand copper
+wand aluminum
+wand titanium
+wand mercury
+staff cypress
+staff bamboo
+staff dogwood
+wand silicon
+staff zebrawood
+wand beryllium
+SEED 12345
+POTIONS
+purple
+black
+grey
+brown
+plaid
+violet
+vermilion
+ecru
+orange
+turquoise
+tan
+magenta
+silver
+gold
+SCROLLS
+readalf shuplu ivnin
+plelaiv solel skibyt monha
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