Task 3 verification evidence

- `bun run typecheck` => exit 0
- `bun test` => `7312 pass / 1 skip / 2 fail / 7315 total` (matches baseline)
- `bun run build` => exit 0

Notes:
- The 2 failures are pre-existing baseline failures in `src/features/opencode-skill-loader/skill-content.test.ts`.