- new note .planning/notes/core-plugins-own-repos.md: shared core plugins live in sm-<name>-plugin repos mounted as submodules
- 01-CONTEXT deferral points to the note; PROJECT constraint and Key Decisions row
- ROADMAP Phase 12 repos and the 12-01 entry, and Phase 12 plans 12-01, 12-02, 12-05 name sm-user-plugin and the submodule commit workflow