Admit BoardCanvas spec to frontend typecheck

[Chris0Jeky]

Summary

• Fix the two current BoardCanvas fixture type errors (Column.cardCount and Card.description).
• Remove only BoardCanvas.spec.ts from the frontend Vitest typecheck quarantine.

Verification

• Scratch admission probe: vue-tsc exits 0 with only this spec admitted.
• npx vitest --run --maxWorkers=2 "src/tests/components/BoardCanvas.spec.ts" (4 passed)
• npm run typecheck
• npm run build (known pre-existing ineffective dynamic-import warning)
• npx eslint "src/tests/components/BoardCanvas.spec.ts"
• git diff --check

No merge or issue close performed. Refs #1607

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.
To continue using code reviews, add credits to your account and enable them for code reviews in your settings.

[Chris0Jeky]

Fresh-context review record (coordinator, 2026-09-06; read-only Opus 5 reviewer over the diff against the merge base; route: the standing D-12 rule for Codex-session PRs — review, fix MEDIUM+ in-PR, merge, disposition comment).

VERDICT: SHIP (round 1). Fixture fixes verified against src/types/board.ts (cardCount: number, description: string), exactly one exclusion removed, include untouched so no other spec is admitted, and vue-tsc -b surfaces any dependency-side error in the Frontend Unit lane. Fixed in-PR (round 2, coordinator commit a01d2d21f): MEDIUM-1 — the in-file quarantine ledger still said 40 files / 391 errors / 262 of 326 specs; it now reads 39 / 389 / 263 with the admission dated. docs/STATUS.md:671,673 carries the same 40-file figure and is corrected in the next STATUS block (coordinator lease).