docs: document smoke tests, integration tests, and add smoke-test command

[TomerFi]

Summary

• Add "Smoke testing" section to CONTRIBUTING.md with usage instructions for scripts/smoke-test.js
• Add "Integration Tests" section describing tests/app-runner.test.js
• Add smoke-test Cursor command (.cursor/commands/smoke-test.mdc)
• List the new command in the Cursor Commands section of CONTRIBUTING.md

Test plan

• No code changes, documentation only

Summary by CodeRabbit

• Documentation
  • Added smoke testing documentation describing how to run tests against live Lambda functions, including environment variable configuration, usage examples for different event types, and retry logic for cold starts.
  • Added integration testing documentation explaining test instantiation, payload signing, and handler verification with fixture-based testing.

[coderabbitai]

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📝 Walkthrough

Walkthrough

A new Cursor IDE command configuration file is added for smoke testing, and the contributing guide is updated with documentation on smoke testing workflows, integration tests, required environment variables, and test fixture locations.

Changes

Cohort / File(s)	Summary
Smoke Test Configuration .cursor/commands/smoke-test.mdc	Adds Cursor IDE command configuration for running smoke tests against a live Lambda function; includes environment variable references and test execution command.
Documentation Updates CONTRIBUTING.md	Expands contributing guide with new sections on smoke testing (including retry logic and GitHub Actions automation), integration tests, and references to test fixtures and Cursor commands.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested labels

status: review started

Poem

🐰 A smoke test hops along with care,
Configuration files floating in the air,
Documentation blooms, so crisp and clean,
The finest workflows ever seen!

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and specifically summarizes the main changes: documenting smoke tests, integration tests, and adding a smoke-test command.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/update-contributing-and-commands

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.20%. Comparing base (2cee3df) to head (80ceb0e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #811   +/-   ##
=======================================
  Coverage   99.20%   99.20%           
=======================================
  Files           8        8           
  Lines        1006     1006           
=======================================
  Hits          998      998           
  Misses          8        8           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
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[coderabbitai]

Actionable comments posted: 2

🤖 Fix all issues with AI agents

In `@CONTRIBUTING.md`:
- Line 128: The long single line in CONTRIBUTING.md describing the Lambda
handler tests exceeds the 120-character limit; break that sentence into multiple
lines (wrap at sensible word boundaries) so each line is <=120 characters while
preserving the same text and links (retain references to
tests/app-runner.test.js, tests/fixtures/, and HMAC-SHA256/Probot/RSA key
wording), ensuring Markdown formatting remains unchanged.
- Around line 37-46: The CONTRIBUTING.md section describing the smoke test has
several lines exceeding the 120-character limit; wrap those long lines so no
line is longer than 120 chars (break at natural boundaries such as after
sentence ends, between list items, or within parentheses) while preserving
content and links for "node scripts/smoke-test.js ping", "node
scripts/smoke-test.js all", the ".github/workflows/smoke-test.yml" mention, and
the "tests/fixtures/" path; update the bullet list and paragraphs to use shorter
lines (or soft wraps) and ensure Markdown formatting and links remain intact.