No CI: lint, type check and build never run on pull requests

[royalpinto007]

Desired outcome

A GitHub Actions workflow runs lint, type check, and build on every pull request.

Why it matters

There is no .github/workflows/ directory in this repo, so nothing is verified automatically. A PR that fails next lint, breaks tsc, or does not build can be merged and only discovered at deploy time. Formatting is also unenforced even though prettier and prettier-plugin-tailwindcss are dependencies and .prettierrc.json is committed, so diffs regularly carry unrelated reformatting noise.

The sibling repo AgentPostmortem/agent-postmortem has a workable .github/workflows/ci.yml (lint and type check, format check, build with placeholder env vars) that can be adapted.

Steps

1. Add .github/workflows/ci.yml triggered on push to main and on pull_request.
2. Jobs: npm ci, then npx tsc --noEmit, npm run lint, npx prettier --check ., and npm run build.
3. Use actions/setup-node with node-version: 20 (matching the engines field) and cache: npm.
4. The build needs the public env vars from .env.example; supply harmless placeholder values in the workflow env block so no secret is required.

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