Add skool/classroom domain skill

[rodkend78]

Adds domain-skills/skool/classroom.md — how to read and edit Skool classroom course/lesson content programmatically.

Field-tested while reformatting 159 lessons across 25 courses in a live community:

• Next-data endpoints for course trees, including the md= redirect trap and the lazy-hydrated desc trap (only the selected module's content is populated).
• The [v2] TipTap desc format with node/mark shapes confirmed to render and round-trip through Skool's own editor (headings, lists, blockquote, codeBlock, links).
• The editor's save endpoint: PUT api2.skool.com/courses/{moduleId} with cookie auth, including the video_id-preservation caveat and the resources-untouched behavior.
• The markdown-pasted-as-literal-text trap and the slow-hydration wait for large lessons.

🤖 Generated with Claude Code

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Summary by cubic

Add domain-skills/skool/classroom.md documenting how to read and edit Skool Classroom lessons programmatically. Covers data endpoints, the TipTap [v2] format, and key traps to make automation reliable.

• New Features
  • Next.js data: use /_next/data/... with md=; handle redirect without md= and lazy desc hydration.
  • Content format: [v2] TipTap nodes/marks that render and round‑trip; note that pasted markdown is saved as literal text.
  • Write flow: PUT https://api2.skool.com/courses/{moduleId} with cookie auth; preserve video_id; resources untouched; verify by structure; note hydration delays on large lessons.

^{Written for commit ba0bb8e. Summary will update on new commits.}

[browser-harness-review]

✅ Skill review passed

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[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}