fix(api): clean up this slice's own lint violations

Fixed five prettier/prettier formatting errors in the three spec files
Slice 0.10 wrote or edited (world-discovery.service.spec.ts,
local-location-interaction.spec.ts, vertical-slice.seed.spec.ts).
Scoped by hand to just those locations so the pre-existing errors
elsewhere in the workspace, unrelated to this slice, are left alone.

Also corrects the implementation notes, which previously understated
the lint state as entirely pre-existing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/playable-slices/0.10-Abandoned-Watchpost-implementation-notes.md

@@ -283,6 +283,18 @@ None of these were judged to change behavior a player can hit; they are
 seams a future slice's tests should tighten, most likely whichever slice
 next touches the combat engine or the seed's encounter-pool weights.
 
+**Lint state.** `npm run lint --workspace=@ashen-realms/api` (scoped to the
+whole API workspace) fails: roughly a hundred `@typescript-eslint` and
+`prettier/prettier` errors remain, all in the quest system, the rewards
+service, the shops module, migration-runner specs and other files this
+slice never touched — confirmed pre-existing by `git blame` timestamps
+predating this branch's base commit. This slice's own files pass lint
+cleanly; the five formatting violations `eslint --fix` originally found in
+`world-discovery.service.spec.ts`, `local-location-interaction.spec.ts` and
+`vertical-slice.seed.spec.ts` were fixed by hand, scoped to just those
+locations. The pre-existing errors are left alone, out of this slice's
+scope and the AGENTS.md rule against unrelated refactoring.
+
 ---
 
 ## 7. Outstanding manual verification