Replace Collections with Plugins as first-class citizens in the repo.
With the Copilot CLI v0.409 release making plugins an on-by-default
marketplace, collections are redundant overhead.
## What changed
### Plugin Infrastructure
- Created eng/validate-plugins.mjs (replaces validate-collections.mjs)
- Created eng/create-plugin.mjs (replaces create-collection.mjs)
- Enhanced all 42 plugin.json files with tags, featured, display, and
items metadata from their corresponding collection.yml files
### Build & Website
- Updated eng/update-readme.mjs to generate plugin docs
- Updated eng/generate-website-data.mjs to emit plugins.json with full
items array for modal rendering
- Renamed website collections page to plugins (/plugins/)
- Fixed plugin modal to use <div> instead of <pre> for proper styling
- Updated README.md featured section from Collections to Plugins
### Documentation & CI
- Updated CONTRIBUTING.md, AGENTS.md, copilot-instructions.md, PR template
- Updated CI workflows to validate plugins instead of collections
- Replaced docs/README.collections.md with docs/README.plugins.md
### Cleanup
- Removed eng/validate-collections.mjs, eng/create-collection.mjs,
eng/collection-to-plugin.mjs
- Removed entire collections/ directory (41 .collection.yml + .md files)
- Removed parseCollectionYaml from yaml-parser.mjs
- Removed COLLECTIONS_DIR from constants.mjs
Closes#711
- Display short commit SHA with link to GitHub commit
- Show build date in YYYY-MM-DD format
- Use GITHUB_SHA env var in CI, fallback to git command locally
- Add subtle styling for build info text
- Standardized string quotes to double quotes across multiple files.
- Improved formatting and indentation for better readability.
- Added a function to format multiline text in tools rendering.
- Enhanced dropdown and action button handlers for better event management.
- Updated the theme application logic to initialize on page load.
- Refactored utility functions for consistency and clarity.
- Improved error handling and user feedback in download and share functionalities.
