chore: update Jest configuration for improved caching

[xwartz]

PR-Codex overview

This PR focuses on enhancing the test suite for a Cursor API, improving error handling, and refining timer management in Jest tests. It also includes updates to the configuration and README for better clarity and functionality.

Detailed summary

• Added Jest cleanup functions to manage timers.
• Improved global test configurations for Jest.
• Updated package.json to include --detectOpenHandles for tests.
• Enhanced error handling in APIClient methods.
• Added comprehensive tests for CursorError and TimeoutError.
• Updated README with new model support and usage examples.
• Added integration tests for Cursor client functionality.
• Enhanced streaming tests to cover edge cases and error handling.
• Improved handling of malformed responses and JSON parsing in tests.

The following files were skipped due to too many changes: tests/core/streaming.test.ts

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[github-actions]

🤖 Auto-labeled this PR with: 🐛 bug, 📚 docs, 🧹 chore, 🧪 test, 📦 dependencies, 🎯 api, 🔧 config, 📚 large

This was done automatically based on the PR title, description, and commits.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.54%. Comparing base (f0a05c4) to head (960245c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/api.ts	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   76.51%   78.54%   +2.02%     
==========================================
  Files           8        8              
  Lines         954      960       +6     
  Branches      298      300       +2     
==========================================
+ Hits          730      754      +24     
+ Misses        186      168      -18     
  Partials       38       38              

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