Adds .github/workflows/ci.yml running lint, typecheck, and build on
pull_request + push to main. Node 20 (matches the engines we'll pin
in the metadata PR), npm cache keyed on package-lock.json,
concurrency cancel so force-pushes don't queue runs.
Also adds a `typecheck` script to package.json — `tsc --noEmit`. Next
runs its own typecheck during `build`, but exposing it as a script
means editors and pre-commit hooks can invoke it cheaply, and CI can
surface type errors separately from build errors.
Build passes with dummy env vars (tested locally with .env.local
moved aside); NEXT_PUBLIC_SUPABASE_URL, NEXT_PUBLIC_SUPABASE_ANON_KEY,
and ENCRYPTION_KEY are set to placeholder values inside the workflow.
Lint is wired up but marked continue-on-error for now: the repo has
14 pre-existing errors from React 19's new react-hooks/set-state-in-
effect rule, across 8 files, that are out of scope for this PR. They
still show up in the CI logs so regressions are visible; a follow-up
PR will fix them and drop the non-blocking flag.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
