[Code Quality] Document engine.extensions in frontmatter.md (shipped key missing from concise reference)

[github-actions]

Description

The engine.extensions frontmatter key is implemented in production (pkg/workflow/pi_engine.go:211,240) and documented in frontmatter-full.md, but is completely absent from the concise frontmatter.md reference. This means users consulting the most common reference page cannot discover a shipped, usable feature.

From the Schema Consistency Check — 2026-07-21:

frontmatter.md documents engine.driver but still omits engine.extensions. The concise frontmatter reference is incomplete for a shipped frontmatter key.

Suggested Changes

• Add engine.extensions entry to docs/src/content/docs/reference/frontmatter.md in the engine section (after engine.driver)
• Mirror the description already in frontmatter-full.md:2478-2485
• Optionally add a short usage example

Files Affected

• docs/src/content/docs/reference/frontmatter.md (add engine.extensions entry, lines ~146-161)

Success Criteria

• engine.extensions appears in frontmatter.md with a clear description
• Description matches the implementation in pkg/workflow/pi_engine.go
• No content is removed or broken in the surrounding engine section

Source

Extracted from 🔍 Schema Consistency Check — 2026-07-21

Priority

Medium — improves discoverability of a shipped feature for all users

🔍 Task mining by Discussion Task Miner - Code Quality Improvement Agent · sonnet46 38.1 AIC · ⌖ 5.38 AIC · ⊞ 7K · ◷

• expires on Jul 22, 2026, 5:13 AM UTC-08:00

[github-actions]

This issue was automatically closed because it expired on 2026-07-22T13:13:44.036Z.

Closed by Workflow