[WIP] Update JavaScript front matter hash consistency algorithm

[Copilot]

Update JavaScript Frontmatter Hash Algorithm

Analysis Complete

• Reviewed Go implementation in pkg/parser/frontmatter_hash.go
• Reviewed JavaScript implementation in actions/setup/js/frontmatter_hash_pure.cjs
• Identified key differences in algorithm approach
• Reviewed test suites and specification document

Key Differences Found

The JavaScript implementation uses a simplified text-based approach that doesn't match the Go implementation:

• Go: Parses YAML, builds canonical frontmatter with specific field selection, uses proper merging
• JavaScript: Uses raw text approach with frontmatter-text and imported-frontmatters
• This causes different hash outputs for the same frontmatter

Implementation Plan

• Update JavaScript to match Go's canonical frontmatter building
• Implement proper field selection (engine, tools, permissions, etc.)
• Implement proper import merging (replace, deep merge, append, union)
• Use YAML parsing instead of text-based approach
• Update tests to validate cross-language hash compatibility
• Run full test suite to ensure no regressions

Next Steps

1. Update frontmatter_hash_pure.cjs to build canonical frontmatter
2. Add YAML parsing dependency or implement minimal parser
3. Update tests to verify Go-JS hash compatibility
4. Validate with real workflow files

Original prompt

Update JavaScript front matter hash consistency algorithm to match go implementation. Use test suite to validate.

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