feat: add CLI version flag

[nanookclaw]

Summary

Adds a --version / -v CLI guard to the outlook-assistant entrypoint so operators can check the installed package version without starting the MCP server. The flag reads package.json, prints @littlebearapps/outlook-assistant v<version>, and exits before config/module loading or startup logs.

Closes #68.

Verification

• npm test -- test/cli-version.test.js --runInBand
• node index.js --version
• node index.js -v
• npm run lint (0 errors; existing warnings unchanged)
• npm run format:check
• git diff --check
• npm test -- --runInBand

Summary by CodeRabbit

• New Features

  • Added --version and -v CLI flags to display the server package name and version information.

• Tests

  • Added test suite validating CLI version flag behavior and output formatting.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: eac87271-38df-4968-bf47-605c120df854

📥 Commits

Reviewing files that changed from the base of the PR and between 080f80e and 152e884.

📒 Files selected for processing (2)

• index.js
• test/cli-version.test.js

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📝 Walkthrough

Walkthrough

This PR adds a --version and -v CLI flag to the server entrypoint that prints the package name and version to stdout and exits cleanly, before any module initialization or startup logging occurs.

Changes

CLI Version Flag

Layer / File(s)	Summary
Version flag implementation and tests index.js, test/cli-version.test.js	Added early CLI flag detection that intercepts --version and -v, reads version from package.json, and prints <name> v<version> to stdout before exiting with code 0. Comprehensive test suite validates output format, exit codes, and confirms no MCP server startup logging is emitted when the flag is used.

🎯 1 (Trivial) | ⏱️ ~5 minutes

🐰 A flag so neat, both short and long,
Reads the version package, never gets it wrong,
Prints the name, the number too, then hops away,
Before the server starts up for the day! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ 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 'feat: add CLI version flag' clearly summarizes the main change—adding a CLI flag for version output.
Linked Issues check	✅ Passed	The PR implements all requirements from issue #68: checks process.argv for --version/-v, reads from package.json, prints the correct format, and exits with status 0.
Out of Scope Changes check	✅ Passed	All changes are directly aligned with issue #68; index.js adds the version flag handler and test/cli-version.test.js provides comprehensive validation tests.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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