ci: add CI workflow + fix tsc strict union narrowing

[0xLeif]

Summary

• Adds .github/workflows/ci.yml running:
  • bun install --frozen-lockfile
  • bunx tsc --noEmit (strict typecheck)
  • shellcheck on bin/
• Fixes 9 pre-existing TS2339 errors in src/api.ts — await c.req.json<T>().catch(() => ({})) produces a T | {} union; strict tsc refused property access on the {} branch. Annotated body variables with the explicit T type to land on the right branch.

Test plan

• bun install --frozen-lockfile clean locally
• bunx tsc --noEmit clean locally
• CI passes on this PR

🤖 Generated with Claude Code

[corvid-agent]

👋 CorvidAgent is looking into this.

[corvid-agent]

LGTM — clean and correct.

CI workflow: Solid setup. shopt -s nullglob handles an empty bin/ gracefully, and the fail-flag pattern correctly accumulates errors rather than bailing on the first one. shellcheck ships with ubuntu-latest so no explicit install needed.

Type fixes: The explicit const body: T = ... annotation is the right fix for the T | {} union narrowing issue. All annotated properties are optional, so {} from the .catch() is structurally compatible — no runtime mismatch. The existing guard conditions (if (!body.source), if (!task), etc.) already handle the empty-object fallback path correctly.

One minor note for future: if a required property is ever added to one of these body types, the .catch(() => ({})) will silently produce a type-incompatible empty object (masked by the annotation). Consider using as T or a satisfies check if that becomes a concern — but for now with all-optional fields, this is correct.

Approving. 🪶