Adopt house golangci-lint config; fix all approved-linter findings

.golangci.yml is the prompts-repo standard verbatim plus one approved
exception (paralleltest, sneak 2026-07-06). Roughly 1,500 findings
fixed:

- autofix sweep (wsl_v5/nlreturn/intrange/modernize formatting), with
  the misspell autofix REVERTED where it rewrote authentic C game text
  ("missle vanishes" stays, with nolint and a comment)
- error handling: errcheck sites get real handling — saveFile now
  closes explicitly and removes corrupt saves, scoreboard writes are
  documented best-effort, err113 sentinel errors (ErrSaveOutOfDate,
  ErrScreenTooSmall); panics allowed for unrecoverable states per
  MEMORY.md policy
- gosec: real fixes (ParseInt for SEED, 0600 scorefile) and justified
  per-line nolints for provably-bounded conversions (randomMonsterLetter
  helper collapses eight rnd(26)+'A' sites)
- API tidying from linters: pointer receivers on flag types
  (recvcheck), msg helpers renamed addmsgf/doaddf/Printwf/MvPrintwf
  (goprintffuncname), myExit()/findFloor(monst)/mkGameInput(t) drop
  always-constant params (unparam), gameEnd carries no status
- gocritic/staticcheck: if-else chains to switches, the pack.c
  inventory filter untangled into matchesFilter, main.go split so
  defers run before exit (exitAfterDefer, funlen)
- revive doc comments on all exported flag types/consts/methods

Remaining findings are confined to linters pending sneak's exception
decision (mnd, gochecknoglobals, cyclop, nestif, gocognit, exhaustive,
goconst, testpackage); TODO.md records the state. MEMORY.md added at
repo root as the project's agent working notes.

game/daemon.go

@@ -10,6 +10,10 @@ package game
 // function-pointer-to-int mapping in state.c rs_write_daemons.
 type DaemonID int
 
+// Daemon and fuse callback identifiers. The first block's numeric values
+// match the function-pointer-to-int mapping in state.c rs_write_daemons;
+// the second block covers fuses state.c never saved (the Go save format
+// handles them all uniformly).
 const (
 	DNone      DaemonID = 0
 	DRollwand  DaemonID = 1
@@ -21,12 +25,10 @@ const (
 	DUnconfuse DaemonID = 7
 	DUnsee     DaemonID = 8
 	DSight     DaemonID = 9
-	// Fuses beyond the C save map (state.c never saved these; the Go save
-	// format handles them uniformly).
-	DVisuals  DaemonID = 10
-	DComeDown DaemonID = 11
-	DLand     DaemonID = 12
-	DTurnSee  DaemonID = 13 // potions.c casts turn_see to a fuse callback
+	DVisuals   DaemonID = 10
+	DComeDown  DaemonID = 11
+	DLand      DaemonID = 12
+	DTurnSee   DaemonID = 13 // potions.c casts turn_see to a fuse callback
 )
 
 // Scheduling phases and slot states (daemon.c).
@@ -59,6 +61,7 @@ func (g *RogueGame) dSlot() *delayedAction {
 			return &g.Daemons.List[i]
 		}
 	}
+
 	panic("ran out of fuse slots") // C: debug message in MASTER, NULL deref otherwise
 }
 
@@ -70,6 +73,7 @@ func (g *RogueGame) findSlot(f DaemonID) *delayedAction {
 			return d
 		}
 	}
+
 	return nil
 }