Watch all six MIDI links from the checklist, including ProPresenter -> Lighting

Adds Tracks -> Livebox, Tracks -> Studio B and ProPresenter -> Lighting
(read on the ProPresenter Mac over SSH), each with the hold-to-reconnect fix.
coremidi.py now recognises the network MIDI driver on macOS 26.2 too
("AppleMIDIRTPDriver"; 26.5 calls it "AppleMIDINetworkDriver"), which is why
the ProPresenter Mac's session looked empty before.

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

README.md

@@ -13,7 +13,7 @@ There are two parts:
 |--------|-------|-------|-------|-------|-------|-------|-------|-------|
 | row 0  | UP | **ALL** | REC | AUDIO | RF | SHOW | VIDEO | STREAM |
 | row 1  | page | HD1 | HD2 | HD3 | HD4 | HD5 | HD6 | TASCAM |
-| row 2  | DOWN | X32 | DANTE | MIDI | APPS | | | |
+| row 2  | DOWN | X32 | DANTE | MIDI | All six network MIDI links on the FOH / Studio B checklist, each named when it drops: **LIGHT PC** (Ingest → Lighting), **SUPERRACK** (Ingest → Livebox), **FX LIGHTS** (Tracks → Lighting, the FX lighting cues), **TRK LIVEBOX** (Tracks → Livebox), **TRK STUDIO B** (Tracks → Studio B), **PROP LIGHTS** (ProPresenter → Lighting). NA Ingest's own session is read locally; NA Tracks' and NA ProP's over SSH every 5 s. Also: the Lighting PC and NA Tracks MIDI sessions still announced on the network. A clean disconnect shows within about 10 s; a crash or pulled cable takes about a minute (macOS's own timeout, measured). Hold 2 s reconnects whichever links dropped. |
 | row 3  | ALARMS | ATEM | OBS | RESI | NET | INGEST | LED | ARENA |
 
 Row 0 holds the group buttons. Each one shows the first problem in its group, plus "+N" if there are more: