feat: include externalDocs link in API markdown output

[rsbh]

Summary

• Add external documentation link to auto-generated API markdown (.md endpoint)
• When an OpenAPI operation has externalDocs.url, renders as: "Read more about this operation in the external documentation."
• Uses externalDocs.description as link label when available, falls back to "external documentation"
• Placed after operation description, before method/path line — helps AI agents and LLMs discover related docs

Test plan

• Add externalDocs to an OpenAPI operation and verify .md endpoint includes the link
• Verify operations without externalDocs are unaffected
• Verify externalDocs.description is used as link text when present

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 25, 2026 8:26am

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⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between f2a6ea5 and b3b5e62.

📒 Files selected for processing (1)

• packages/chronicle/src/server/utils/api-markdown.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch worktree-api-md-external-docs

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