Fix and check builders: every fix is built from fields; today's 27 fixes carry their templates

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>

settings/server.py

@@ -31,6 +31,7 @@ from settings import PARENT, HERE  # noqa: F401
 import schema
 import status_panel as sp
 from settings import apply as applying
+from settings import builders
 from settings import keyguide, probes
 
 log = logging.getLogger("status-settings")
@@ -644,6 +645,8 @@ class Handler(http.server.BaseHTTPRequestHandler):
             if path == "/api/live/midi":
                 snap = site.read_json("snapshot.json", {}) or {}
                 return self.send(200, {"local": snap.get("midi"), "remote": snap.get("remote_midi")})
+            if path == "/api/builders":
+                return self.send(200, {"fixes": builders.template_list(site.cfg), "checks": builders.check_template_list()})
             if path == "/api/facts":
                 return self.send(200, {"facts": COMPANION_FACTS})
             if path == "/api/snapshot":
@@ -734,6 +737,15 @@ class Handler(http.server.BaseHTTPRequestHandler):
                 site.draft.clear()
                 self.discard_atem()
                 return self.send(200, {"ok": True})
+            if path in ("/api/build", "/api/build-check"):
+                cfg = (site.draft.read() or {}).get("config") or site.load()
+                try:
+                    if path == "/api/build":
+                        fix = builders.build(cfg, body.get("fix") or {})
+                        return self.send(200, {"ok": True, "fix": fix, "label": builders.suggest_label(cfg, fix)})
+                    return self.send(200, {"ok": True, "check": builders.build_check(cfg, body.get("check") or {})})
+                except ValueError as e:
+                    return self.send(200, {"ok": False, "error": str(e)})
             if path == "/api/validate":
                 cfg = schema.unmask(body.get("config") or (site.draft.read() or {}).get("config") or site.load(), site.load())
                 return self.send(200, self.check(cfg))