Publish pinned contract corrections and Context preview
Refresh the retained Docs publication from Marketing 62cc352c4c90d4578bea4352001fc459b7566e1b, including corrected social/catalog/chat/task/callback contracts, artist pinning, CLI and Sites instructions, Context preview schemas/MCP mappings, and explicit pending availability for ten unmatched REST paths. Update contributor guidance to the maintained split-spec authoring workflow.
Validation: all 231 file hashes and navigation match the pinned Marketing commit; diff checks pass. Host settings are preserved. This PR prepares a review copy; refresh the provenance to the actual Marketing merge commit before releasing. Mintlify connection repair, host cutover, DNS, redirects and hosted workflow acceptance remain separate.
Companions: https://github.com/recoupable/api/pull/1032 and https://github.com/recoupable/cli/pull/26. Marketing companion: https://github.com/recoupable/marketing/pull/152. App instruction companion: https://github.com/recoupable/app/pull/2242.
Refs recoupable/mono#318 and recoupable/mono#356. Feature acceptance tickets remain open until their release/readback gates are met.