docs/host-plugin-blueprint.md — build guide for visual host plugins extracted from bb-plugin-stelow: card lifecycle, inbox event model, ask/answer protocol, skills sync recipe, worker presets, UI patterns, portable modules, anti-patterns. Linked from HOSTING.md, AGENTS.md, and README.md.
Changed
Host docs synced with the plugin reality — HOSTING.md, README.md, and AGENTS.md no longer say product playbooks come only from the skills hub (bb-plugin-stelow vendors all 28 skills).
DeepWiki steering — official badge markup + .devin/wiki.json with repo_notes (pages list deliberately omitted so future coverage isn't frozen).