settings/builders.py renders a fix's command from a builder (template) and its fields; validate refuses a config whose stored command no longer equals what its fields build; the Fixes screen and the remote checks in the key editor rebuild through /api/build and /api/build-check. config.json adopts templates for all 27 fixes and 5 remote checks (ProPresenter's restart loop and Ableton's quoting normalised, same behaviour); tests/test_builders.py (174 tests pass). Deployed to NA Ingest. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>