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/move.go

@@ -1,3 +1,4 @@
+//nolint:mnd // C-faithful literals; names hurt C-greppability (approved 2026-07-07)
 package game
 
 // move.c — hero movement commands.
@@ -60,7 +61,9 @@ func (g *RogueGame) moveHero(dy, dx int) {
 // moveResolve acts on the square the hero stepped at: a wall may turn a
 // passage runner (reported with the new deltas); anything else completes
 // or refuses the move (the switch of move.c do_move).
-func (g *RogueGame) moveResolve(nh Coord, ch byte, fl PlaceFlags, dy, dx int) (bool, int, int) {
+func (g *RogueGame) moveResolve(
+	nh Coord, ch byte, fl PlaceFlags, dy, dx int,
+) (bool, int, int) {
 	switch ch {
 	case ' ', '|', '-':
 		if turn, ndy, ndx := g.passageTurn(dy, dx); turn {
@@ -343,7 +346,8 @@ func (g *RogueGame) trapMystery(Coord) {
 	case 0:
 		g.msg("you are suddenly in a parallel dimension")
 	case 1:
-		g.msg("the light in here suddenly seems %s", g.data.rainbow[g.rnd(len(g.data.rainbow))])
+		g.msg("the light in here suddenly seems %s",
+			g.data.rainbow[g.rnd(len(g.data.rainbow))])
 	case 2:
 		g.msg("you feel a sting in the side of your neck")
 	case 3: