Add PR-level CI workflow (lint + test on pull_request)

[Fl0p]

Summary

• Adds .github/workflows/ci.yml triggered on pull_request
• Runs pnpm install --frozen-lockfile, pnpm lint, pnpm test --run
• No deploy step and no secrets required — safe for all PRs including forks
• Concurrency group cancels in-progress runs on the same ref to avoid stale checks

Test plan

• Merge this PR and open a follow-up PR to observe the CI check (green)
• In a follow-up PR, introduce a lint violation to confirm the check goes red

Closes FLO-170

🤖 Generated with Claude Code

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 57793292-4b34-4d58-9a97-a7a34863e422

📥 Commits

Reviewing files that changed from the base of the PR and between 710f344 and 38ceecf.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch flo-170-pr-ci-gate

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