Add PR validation workflow

[TianqiZhang]

Summary

• Add a CI workflow for PR validation of the CLI package
• Run npm install, build, unit tests, and a deterministic fixture-backed CLI smoke test on PRs
• Add a live catalog smoke test for pushes to main and manual workflow runs
• Scope event cache loading so --event checks only fetch/manage the requested event

Validation

• npm run build
• npm test
• npm run smoke:fixture
• npm run smoke:live

[Copilot]

Pull request overview

This PR adds PR/push CI validation for the cli/ package (build, unit tests, and smoke tests), and updates cache loading so --event scoped commands only load/fetch the requested event’s cache.

Changes:

• Add a GitHub Actions CI workflow to run npm ci, build, unit tests, and a fixture-backed CLI smoke test on PRs; additionally run a live-catalog smoke test on non-PR runs.
• Introduce fixture and live smoke test scripts and wire them into cli/package.json scripts.
• Scope ensureCache() to an optional event filter and add/extend tests verifying scoped cache behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
cli/test/cache.test.ts	Adds tests ensuring scoped cache loading doesn’t touch unrelated events and handles failures without fallback.
cli/src/commands/sessions.ts	Validates --event and scopes cache loading to the requested event.
cli/src/commands/session.ts	Validates --event and scopes cache loading to the requested event.
cli/src/commands/common.ts	Updates ensureCache() to accept an optional event filter and adjusts fallback behavior accordingly.
cli/scripts/smoke-live.mjs	Adds a live catalog smoke test that refreshes cache and verifies status/sessions/session output.
cli/scripts/smoke-fixture.mjs	Adds a deterministic fixture-backed smoke test that seeds cache files and validates CLI behavior.
cli/package.json	Adds smoke:fixture and smoke:live npm scripts.
.github/workflows/ci.yml	Adds CI workflow to run build/test and smoke tests (fixture on PRs; live on non-PR runs).

[pdebruin]

#21