[docs] Update documentation for features from 2025-11-12

[github-actions]

Documentation Updates - 2025-11-12

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

• Action SHA Validation (from Add action SHA validation to compile --validate command #3631) - Enhanced compile --validate command
• Fingerprint Field (from Add optional fingerprint field for asset tracking #3602) - New asset tracking capability

Changes Made

CLI Documentation (docs/src/content/docs/setup/cli.md)

• Updated --validate flag description to include action SHA validation
• Added explanation that outdated action SHAs trigger warnings

Frontmatter Documentation (docs/src/content/docs/reference/frontmatter.md)

• Added new section documenting the fingerprint: field
• Included usage examples and search patterns
• Explained validation rules and use cases

Merged PRs Referenced

• Add action SHA validation to compile --validate command #3631 - Add action SHA validation to compile --validate command
• Add optional fingerprint field for asset tracking #3602 - Add optional fingerprint field for asset tracking
• Fix Copilot agent path to use identifier instead of full path #3686 - Fix Copilot agent path to use identifier instead of full path (internal, no docs needed)
• Downgrade engine default message to trace level #3687 - Downgrade engine default message to trace level (internal, no docs needed)
• Add charts-with-trending shared workflow with cache-memory integration #3673 - Add charts-with-trending shared workflow (internal workflow, no user docs needed)

Notes

The fingerprint field was already documented in frontmatter-full.md (auto-generated from schema), but this PR adds it to the main user-facing frontmatter.md guide with examples and practical usage patterns.

The charts-with-trending shared workflow (#3673) is an internal improvement for workflow authors and doesn't require changes to the main user documentation.

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