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/wizard.go

@@ -1,3 +1,4 @@
+//nolint:mnd // C-faithful literals; names hurt C-greppability (approved 2026-07-07)
 package game
 
 // wizard.c — special wizard commands, some of which are also non-wizard
@@ -25,6 +26,7 @@ func (g *RogueGame) createObj() {
 	obj.Count = 1
 	g.Msgs.Mpos = 0
 
+	//nolint:exhaustive // C-faithful: only the cases C handled (approved 2026-07-07)
 	switch obj.Kind {
 	case KindWeapon, KindArmor:
 		g.createWeaponArmor(obj)
@@ -82,6 +84,7 @@ func (g *RogueGame) createWeaponArmor(obj *Object) {
 // createRing sets up a wizard-created ring, prompting for a bonus on
 // the bonus rings (the ring arm of wizard.c create_obj).
 func (g *RogueGame) createRing(obj *Object) {
+	//nolint:exhaustive // C-faithful: only the cases C handled (approved 2026-07-07)
 	switch obj.RingKind() {
 	case RingProtection, RingAddStrength, RingDexterity, RingIncreaseDamage:
 		g.msg("blessing? (+,-,n)")
@@ -136,6 +139,7 @@ func (g *RogueGame) whatis(insist bool, kind ObjectKind) {
 		return
 	}
 
+	//nolint:exhaustive // C-faithful: only the cases C handled (approved 2026-07-07)
 	switch obj.Kind {
 	case KindScroll:
 		setKnow(obj, g.Items.Scrolls[:])