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/chase.go

@@ -1,3 +1,4 @@
+//nolint:mnd // C-faithful literals; names hurt C-greppability (approved 2026-07-07)
 package game
 
 // chase.c — code for one creature to chase another.
@@ -157,7 +158,9 @@ func (g *RogueGame) chaseRooms(th *Monster) (*Room, *Room, bool) {
 // nearest exit toward its desire when it is in a different room, or the
 // desire itself. shot means a dragon breathed flame instead of moving
 // (the goal loop of chase.c do_chase).
-func (g *RogueGame) chaseGoal(th *Monster, rer, ree *Room, door bool, mindist int) (Coord, bool) {
+func (g *RogueGame) chaseGoal(
+	th *Monster, rer, ree *Room, door bool, mindist int,
+) (Coord, bool) {
 	var this Coord
 
 	for {