chore(lint): adopt canonical golangci-lint config

Replace .golangci.yml with the shared canonical config. The old
config's top-level linters-settings block was silently ignored under
the v2 schema, so the lll/funlen/cyclop/dupl thresholds now actually
apply. The four repo-specific disables (mnd, exhaustive, paralleltest,
testpackage) move out of the config into targeted in-code nolint
directives carrying their original approval dates, keeping the config
byte-identical to the canonical one.

Fixes surfaced by the stricter settings: t.Parallel() added to all 32
tests, 24 overlong lines wrapped or their comments tightened, tcell
control-code returns rewritten as character literals, dupl markers on
the identically-shaped item data tables, and two wsl_v5 defer cuddles.

No behavior changes. The repo has no golangci-lint version pin (no
Dockerfile or CI; make lint runs the host binary, currently v2.12.2),
so there was nothing to bump.

game/sticks.go

@@ -1,3 +1,4 @@
+//nolint:mnd // C-faithful literals; names hurt C-greppability (approved 2026-07-07)
 package game
 
 import "fmt"
@@ -272,6 +273,7 @@ func slowTarget(tp *Monster) {
 func (g *RogueGame) zapBolt(obj *Object) bool {
 	var name string
 
+	//nolint:exhaustive // C-faithful: only the cases C handled (approved 2026-07-07)
 	switch obj.WandKind() {
 	case WandLightning:
 		name = "bolt"
@@ -434,7 +436,9 @@ func boltBounces(ch byte, heroPos, pos Coord) bool {
 // boltStrikesMonster resolves a bolt arriving on a monster's square (the
 // monster arm of the fire_bolt loop). It reports whether the bolt was
 // used up.
-func (g *RogueGame) boltStrikesMonster(tp *Monster, bolt *Object, pos Coord, ch byte, name string, fromHero bool) bool {
+func (g *RogueGame) boltStrikesMonster(
+	tp *Monster, bolt *Object, pos Coord, ch byte, name string, fromHero bool,
+) bool {
 	tp.OldCh = g.Level.Char(pos.Y, pos.X)
 	if !g.saveThrow(VsMagic, &tp.Stats) {
 		bolt.Pos = pos
@@ -506,6 +510,7 @@ func (g *RogueGame) fixStick(cur *Object) {
 
 	cur.HurlDmg = dice("1x1")
 
+	//nolint:exhaustive // C-faithful: only the cases C handled (approved 2026-07-07)
 	switch cur.WandKind() {
 	case WandLight:
 		cur.Charges = g.rnd(10) + 10