Tune key at every location: the key the tracks send must reach each location's FOH (SuperRack) in that location's own Planning Center key

NA works out each location's expected Waves Tune programs (campus_tune) and serves them at /api/tune/<id>; locations
fetch their list, read ProPresenter through Companion's connection, and compare with a MIDI witness on the FOH Mac
(SC FOH now; WS FOH needs the Command Line Tools first). FOH KEY WRONG / FOH GOT NO KEY.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

schema.py

@@ -327,6 +327,8 @@ field("tiles[].checks[].name", "str", None, "The name the key shows.", "Keys")
 field("tiles[].checks[].msg", "str", None, "The words the key shows when it fails.", "Keys")
 field("tiles[].checks[].failures", "int", 2, "Pings missed before NO PING.", "Keys", advanced=True, lo=1, hi=10)
 field("tiles[].checks[].label", "str", None, "The launchd helper.", "Keys")
+field("tiles[].checks[].expect", "enum", None, "A location: the keys its songs must arrive in come from the hub (its own Planning Center keys).", "Keys", advanced=True, options=["hub"])
+field("tiles[].checks[].prop_conn", "str", None, "The Companion connection that reaches this location's ProPresenter (for the song on screen).", "Keys", advanced=True)
 field("tiles[].checks[].address", "str", None, "RossTalk: the address of the machine that must be connected (\"local\": a program on this Mac).", "Keys")
 field("tiles[].checks[].process", "str", None, "RossTalk from this Mac: the program's name (ProPresenter).", "Keys", advanced=True)
 field("tiles[].checks[].off_msg", "str", None, "What the key says when Companion's RossTalk listener is off.", "Keys", advanced=True)
@@ -549,7 +551,7 @@ CHECKS = {
                   "question": "Is Spotify playing?", "words": "Spotify is playing the service playlist."},
     "mdns":      {"fields": ["instance", "name"], "subs": ["mdns"], "identity": ["instance"], "module": None,
                   "question": "Is a MIDI link up?", "words": "A network MIDI session is advertised on Bonjour."},
-    "tune_rx":   {"fields": ["host", "name"], "subs": ["tune"], "identity": ["host"], "module": None,
+    "tune_rx":   {"fields": ["host", "name", "expect", "prop_conn"], "subs": ["tune"], "identity": ["host"], "module": None,
                   "question": "Did the key arrive?", "words": "The Waves Tune key the tracks send arrives on a Mac (midi_witness.py there)."},
     "midi_rx":   {"fields": ["source", "name", "max_silence_seconds"], "subs": ["rx"], "identity": ["source"], "module": None,
                   "question": "Is a MIDI link up?", "words": "MIDI is arriving from a source."},