[docs] Remove bloat from AI Engines documentation

[github-actions]

Documentation Cleanup: AI Engines Reference

This PR removes bloat from docs/src/content/docs/reference/engines.md while preserving all essential information.

File Improved

• docs/src/content/docs/reference/engines.md

Types of Bloat Removed

1. Duplicate secret setup instructions

   • Consolidated 5 repetitive gh secret set command blocks into 3 concise blocks
   • Unified all secrets under clear "Required Secrets" sections with both commands shown together

2. Redundant GITHUB_MCP_TOKEN documentation

   • Removed 2 duplicate sections explaining the same concept
   • Consolidated into single line references to GitHub Tools Remote Mode

3. Verbose configuration descriptions

   • Changed "Copilot-specific fields" from 3 verbose bullet points to concise descriptions
   • Removed unnecessary "(optional)" repetition from field descriptions
   • Streamlined inline comments in code examples

4. Excessive command-line arguments section

   • Removed redundant example showing the CLI command structure
   • Condensed "Common use cases" and "Important notes" bullet lists into flowing prose
   • Eliminated repetitive "Example with multiple arguments" section

5. Repetitive migration examples

   • Reduced migration section from 3 different examples to 2 clear examples
   • Removed redundant comments showing "Old" and "New" engine values

6. Verbose Custom Engine section

   • Reduced 3-bullet feature list to single descriptive sentence
   • Maintained all technical information in more concise format

Metrics

• Line count: 252 → 194 lines (23% reduction)
• Secret command blocks: 5 → 3 (consolidated)
• GITHUB_MCP_TOKEN sections: 4 mentions → 2 references (deduplicated)

Content Preserved

✅ All technical accuracy and specific details
✅ All code examples (consolidated duplicates)
✅ All links to external resources
✅ All critical warnings and notes
✅ All frontmatter metadata
✅ All configuration options and fields

Screenshot

The rendered documentation page maintains full clarity with improved conciseness:

Blocked Domains

✅ No blocked CSS, font, or resource domains detected during screenshot capture.

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Cache Updated: Added to /tmp/gh-aw/cache-memory/cleaned-files.txt to avoid duplicate cleanup in future runs.

AI generated by Documentation Unbloat

[pelikhan]

@copilot use markdown headers

[Copilot]

@pelikhan I've opened a new pull request, #1812, to work on those changes. Once the pull request is ready, I'll request review from you.

[github-actions]

Agentic Changeset Generator triggered by this pull request