chore: e2e test skill

[maxy-shpfy]

Description

Added comprehensive Playwright E2E testing skill documentation for Pipeline Studio. This includes a complete testing guide with helper functions, selector catalog, debugging workflows, and best practices for writing reliable end-to-end tests.

The documentation covers:

• Interactive debugging with playwright-cli for agent-based development
• Complete helper function reference for common testing patterns
• Comprehensive selector catalog for all UI components
• Best practices for test reliability and maintainability
• React Flow-specific gotchas and workarounds

Related Issue and Pull requests

Type of Change

• Bug fix
• New feature
• Improvement
• Cleanup/Refactor
• Breaking change
• Documentation update

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Test Instructions

1. Review the documentation files in .cursor/skills/playwright-testing/
2. Verify the helper functions and selectors match the current codebase
3. Test the playwright-cli debugging workflow with a local development environment

Additional Comments

This skill documentation is designed to help developers write more reliable E2E tests and debug test failures more effectively. The playwright-cli integration provides a token-efficient way for coding agents to interact with the browser during development and debugging.

[maxy-shpfy]

• chore: e2e test skill #1842 👈 (View in Graphite)
• master

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