go: port dungeon generation, items base, pack, and monster creation

rooms.c, passages.c, new_level.c ported in full: room/maze layout,
corridor spanning tree with extra connections, passage numbering flood
fill, trap/stairs/object placement, treasure rooms. Careful RNG-call
ordering throughout keeps generation seed-faithful to C.

Supporting subsystems this depends on, also ported:
- screen.go: curses replaced by in-memory Window cell buffers behind a
  Terminal interface (tcell arrives with the UI phase; tests run headless)
- io.go: msg/addmsg/endmsg message-line protocol, status line, step_ok
- pack.c in full (add_pack sorting/stacking walk, get_item, inventory)
- things.c in full (inv_name, new_thing, discovery lists, pagination)
- monsters.c in full; chase.c navigation half (roomin/cansee/see_monst/
  find_dest/runto/set_oldch); rings.c, armor.c in full
- weapons.c/sticks.c creation half (init_weapon, fix_stick, num)
- misc.c look() display update, eat, level-up, direction input
- daemons.c callbacks except stomach (needs death()) and the runners
  chase driver (combat phase)
- init.c init_player with the starting kit

Tests: level invariants across seeds, determinism, 30-depth sweep.

game/sticks.go

@@ -0,0 +1,35 @@
+package game
+
+import "fmt"
+
+// sticks.c — wand and staff setup and naming. Zapping (do_zap, drain,
+// fire_bolt) arrives with the combat phase.
+
+// fixStick sets up a new wand or staff (sticks.c fix_stick).
+func (g *RogueGame) fixStick(cur *Object) {
+	if g.Items.WandType[cur.Which] == "staff" {
+		cur.Damage = "2x3"
+	} else {
+		cur.Damage = "1x1"
+	}
+	cur.HurlDmg = "1x1"
+
+	switch cur.Which {
+	case WsLight:
+		cur.SetCharges(g.rnd(10) + 10)
+	default:
+		cur.SetCharges(g.rnd(5) + 3)
+	}
+}
+
+// chargeStr returns the charge-count suffix for an identified stick
+// (sticks.c charge_str).
+func chargeStr(g *RogueGame, obj *Object) string {
+	if !obj.Flags.Has(IsKnow) {
+		return ""
+	}
+	if g.Options.Terse {
+		return fmt.Sprintf(" [%d]", obj.Charges())
+	}
+	return fmt.Sprintf(" [%d charges]", obj.Charges())
+}