improve(mcp): render agent prompts as compact execution guides (#1260)

[JeremyDev87]

Summary

• Render mandatory_checklist as - [rule_name] description bullets instead of checkbox format
• Render verification_guide as bullet list, supporting both array and object formats
• Render execution_order with proper incremental numbering (1., 2., 3....)
• Replace JSON.stringify in mode-specific instructions with readable markdown via renderValueAsText
• Add trimList helper: cap long sections at 10 items + ... and N more overflow indicator
• No raw JSON braces ({, }) in generated prompt output

Closes #1260

Test plan

• Mandatory checklist renders with rule name prefix, not JSON objects
• Verification guide renders as bullet list (array format)
• Execution order renders with incremental numbered steps
• No raw JSON braces in mode-specific instructions
• Long sections (>10 items) trimmed with overflow indicator
• Mode-specific instructions render as readable markdown
• All 5858 existing tests pass
• TypeScript type-check passes
• Lint clean

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Apr 4, 2026 1:32am

[JeremyDev87]

Review: APPROVE ✅

CI Status: ALL PASS (25/25)

Code Quality

• trimList(): clean 10-item cap with "... and N more" overflow
• renderValueAsText(): recursive markdown renderer replaces JSON.stringify
• Mandatory checklist: - [key] rule format (more informative than - [ ])
• Execution order: proper sequential numbering (was all 1.)
• Mode-specific instructions: readable markdown, no JSON braces
• Backward compatibility: array format still works

Tests (6 new)

• Verification guide array rendering
• No JSON braces in mode-specific sections
• Trim mandatory checklist (15→10 + overflow)
• Trim verification guide (13→10 + overflow)
• Trim execution order (12→10 + overflow)
• Mode-specific as readable markdown

No Issues Found

• No unused imports/variables
• No any types
• No raw JSON in output

Recommendation: APPROVE