Phase 12: frame-accurate timecode via an overscan band — vgstrip encoder/decoder, sweep writes tmcd + creation_time + sidecar, dumpd /time, Caddy /time routes, MediaMTX microsecond names, /dock/clock/ page, dock band setup via obs-websocket, Go Live band composite + toggle, portal crops the band

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

bin/dumpd.py

@@ -161,6 +161,9 @@ class H(BaseHTTPRequestHandler):
     def do_GET(self):
         if self.server.server_port == AUTH_LISTEN[1]:
             return self._json(404, {"error": "not found"})          # the auth port serves POST /mtx-auth only
+        if self.path.startswith("/time"):
+            # server clock for the timecode strip (the /clock/ page and Go Live measure their offset against this)
+            return self._json(200, {"now_ms": int(_time.time() * 1000)})
         if self.path.startswith("/me/stream-token") or self.path.startswith("/me/stream-key"):
             # Only reachable through Caddy behind Authentik forward-auth, which injects the identity headers.
             who, _ = identity(self.headers)