Implement Collections feature for grouping related prompts, instructions, and chat modes

[Copilot]

• Implement Collections feature with YAML parsing and README generation
• Add validation tooling and comprehensive error checking
• Create VS Code tasks and creation scripts for developer experience
• Add comprehensive documentation and examples
• Fix YAML parsing logic bug in both update-readme.js and validate-collections.js
• Improve developer experience with interactive collection creation and code refactoring

Recent Improvements

Code Refactoring & Developer Experience:

• Extracted YAML parser: Created shared yaml-parser.js module to eliminate code duplication between update-readme.js and validate-collections.js
• Interactive collection creation: Refactored create-collection.js to use interactive prompts instead of error exits, with friendly messaging and user guidance
• Improved error handling: Enhanced error messages to be more helpful and suggest actionable next steps
• Configuration improvements: Made collection limits configurable with MAX_COLLECTION_ITEMS constant
• Auto-directory creation: Updated scripts to automatically create collections directory when needed
• Documentation ordering: Positioned collections as the last item in navigation as a non-standard customization

Previous Bug Fix

Fixed a critical bug in the YAML parsing logic where the condition leadingSpaces > leadingSpaces was always false. This was preventing proper parsing of nested properties in array items (like path: and kind: properties in collection items).

Root Cause: Copy-paste error resulting in a variable being compared to itself
Fix: Changed condition to leadingSpaces > 2 to properly handle array item properties that are indented at 4+ spaces
Impact: Collections now parse correctly with all nested properties preserved

Files Fixed:

• update-readme.js:170 - Fixed impossible condition in YAML parser
• validate-collections.js:102 - Fixed identical issue in validation script

Validation: Tested with existing collection files to confirm proper parsing of all YAML structures including array items and display objects.

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[Copilot]

Pull Request Overview

This PR implements a comprehensive Collections feature for organizing related prompts, instructions, and chat modes into curated themes and workflows. The implementation includes YAML parsing, validation tooling, developer experience enhancements, and comprehensive documentation generation.

• Adds shared YAML parser module with proper error handling and code deduplication
• Implements collection validation with comprehensive schema checking and file existence verification
• Creates developer-friendly tools including interactive collection creation and VS Code tasks
• Generates complete documentation with collection overview tables and individual README files

Reviewed Changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
yaml-parser.js	New shared YAML parser module extracted from validation scripts to eliminate duplication
validate-collections.js	Comprehensive collection validation script with schema checking and file verification
update-readme.js	Enhanced README generator with collections support and individual collection documentation
instructions/collections.instructions.md	Development guidelines for creating and managing collections
create-collection.js	Interactive collection creation script with user-friendly prompts and validation
collections/*.md	Generated collection documentation with install badges and item listings
collections/*.collection.yml	Collection manifest files defining grouped items and metadata
README.md	Updated main README with collections navigation link
README.collections.md	Generated collections overview with all available collections
.vscode/tasks.json	VS Code tasks for collection creation and validation
.schemas/collection.schema.json	JSON schema for collection manifest validation
.github/workflows/validate-readme.yml	CI workflow updated to validate collections