chore: Remove unused .github/ files

[Artmann]

Summary by CodeRabbit

• Chores
  • Removed GitHub Actions workflow configurations and automation setup files.
  • Removed internal development instructions and documentation files.
  • Removed GitHub issue automation rules and chat mode configurations.
  • Removed test plan documentation and development guidance files.
  • Simplified pull request template.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request removes a comprehensive set of configuration, documentation, and workflow files from the .github directory. Deleted items include GitHub Actions composite actions (build-vsix, npm-ci, python setup), AI/Copilot-related prompts and chat modes, extensive architecture instruction files covering kernel, platform, IPyWidgets, and notebook systems, GitHub automation configuration (classifier.json, commands.json), test planning documentation, and various setup workflows. The .github directory is substantially reduced, with approximately 5,700 lines removed across 26 files.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	Title accurately summarizes the changeset: removes unused .github/ configuration and documentation files across 30+ file deletions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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📜 Recent review details

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

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📥 Commits

Reviewing files that changed from the base of the PR and between 0eea12a and 2012524.

📒 Files selected for processing (27)

• .github/PULL_REQUEST_TEMPLATE.md
• .github/actions/build-vsix/action.yml
• .github/actions/create-venv-for-tests/action.yml
• .github/actions/npm-ci/action.yml
• .github/actions/set-python-conda/action.yml
• .github/actions/set-python/action.yml
• .github/chatmodes/bugfix.chatmode.md
• .github/classifier.json
• .github/commands.json
• .github/copilot-instructions.md
• .github/document.prompt._md
• .github/instructions/interactiveWindow.instructions.md
• .github/instructions/ipywidgets.instructions.md
• .github/instructions/kernel-jupyter.instructions.md
• .github/instructions/kernel.instructions.md
• .github/instructions/notebooks.instructions.md
• .github/instructions/platform.instructions.md
• .github/instructions/standalone.instructions.md
• .github/instructions/typescript.instructions.md
• .github/prompts/analyze.prompt.md
• .github/prompts/explain.prompt.md
• .github/prompts/implement.prompt.md
• .github/prompts/plan.prompt.md
• .github/test_plan.md
• .github/workflows/cd.yml
• .github/workflows/copilot-setup-steps.yml
• .github/workflows/week.js

💤 Files with no reviewable changes (26)

• .github/chatmodes/bugfix.chatmode.md
• .github/prompts/implement.prompt.md
• .github/actions/create-venv-for-tests/action.yml
• .github/PULL_REQUEST_TEMPLATE.md
• .github/instructions/kernel.instructions.md
• .github/instructions/interactiveWindow.instructions.md
• .github/instructions/typescript.instructions.md
• .github/classifier.json
• .github/actions/build-vsix/action.yml
• .github/commands.json
• .github/instructions/notebooks.instructions.md
• .github/prompts/explain.prompt.md
• .github/prompts/analyze.prompt.md
• .github/instructions/kernel-jupyter.instructions.md
• .github/test_plan.md
• .github/actions/set-python/action.yml
• .github/actions/set-python-conda/action.yml
• .github/instructions/platform.instructions.md
• .github/prompts/plan.prompt.md
• .github/workflows/week.js
• .github/instructions/ipywidgets.instructions.md
• .github/workflows/copilot-setup-steps.yml
• .github/copilot-instructions.md
• .github/instructions/standalone.instructions.md
• .github/actions/npm-ci/action.yml
• .github/document.prompt._md

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0%. Comparing base (0eea12a) to head (2012524).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #293   +/-   ##
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