feat: migrate E2E to offline integration tests

[Gumball12]

Summary

• Replace slow, flakey E2E tests with fast, deterministic offline integration tests.
• Extract runtime orchestration into src/app.ts for clearer entrypoint and easier testing.
• Update CI to run lint, unit, and integration tests with coverage.

Changes

Tests

• Removed legacy E2E suite and helpers under src/e2e/**
• Added integration tests under src/tests/integration/** with Nock-based network isolation
• New vitest.integration.config.ts and integration setup (src/tests/integration/setup.ts)
• Updated unit test config to exclude integration and keep coverage clean (vitest.config.ts)
• Adjusted test helpers and setup to silence logs during tests

CI

• .github/workflows/ci.yml now runs:
  • yarn lint && yarn test:unit
  • yarn test:integration
  • Codecov upload (coverage-final.json)
• Conditional mocked-request tests on push/release via env

Runtime / Structure

• New src/app.ts containing createRuntime, syncCommitsFlow, releaseTrackingFlow, and start
• Simplified src/index.ts to initialize logging and delegate to app.start()

Docs

• CONTRIBUTING.md: updated local dev flow, PAT guidance, and test commands
• README.md: clarified testing sections and integration test usage
• Added AGENTS.md for contributor/agent guidance

Tooling

• package.json scripts: test:unit, test:integration, test (aggregate), lint uses prettier on {src,test}/*/.ts
• yarn.lock updated
• Removed vitest.e2e.config.ts

Rationale

• Integration tests run fully offline and are more reliable, faster, and easier to maintain.
• Separating entrypoint (index.ts) from orchestration (app.ts) improves readability and testability.
• CI explicitly executes unit and integration suites, improving signal and isolation.

Breaking Changes

Noop; behavior should remain the same. Only test strategy and internal structure changed.

[Gumball12]

@codex review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (7379dfb) to head (bed09db).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   99.24%   99.24%           
=======================================
  Files          19       19           
  Lines         797      797           
  Branches      184      184           
=======================================
  Hits          791      791           
  Misses          6        6           

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