- [x] Runner dev defaults: Gate‑C(JSON→Core)
- [x] Freeze policy documented (allow/deny) and referenced in code comments
- [x] Gate‑C env/child helpers unified; normalize only when plugins=ON
- [x] Self‑host bootstrap canaries green (bootstrap_min, nested_if opt‑in)
- [x] Builder mutate→consume canaries green (push→size, set→compare)
- [x] SSOT generated by lang; Rust consumes (no manual tables)
- [x] Docs updated（env toggles・freeze方針・導線）