docs(gig): green gate, and the rehearsal is the whole remainder

0 fail / 3 warn / 39 ok with the rig warm, 132/132 banks, 0 xruns per hour —
the 457/hour this morning was the dead NVIDIA sink, not the CPU.

Five learnings archived from the morning, all one shape: a check that asks the
wrong question reports success. A resolver matching hardware by product name
outlived the hardware in three files at once; a capability check that asked
'is the tool installed' wrote midi:true over nine empty sessions; a probe
gated on a precondition it did not need skipped the entire setup window; an
availability flag structurally incapable of being false hid a disconnected
cable for months; and a unit's start time is the only thing that distinguishes
running code from readable code.

TODO_GIG.md

@@ -460,3 +460,39 @@ correct whether or not the driver runs.
 - [ ] **YOU: the 2h run with Ardour recording.** Unmoved since Sunday. It is the
       only check that has never been run, and the only one that can still
       surprise you.
+
+## Wed 23, 10:40 — the rig is green and the rehearsal is the whole remainder
+
+`check-gig`: **0 fail, 3 warn, 39 ok, 1 skipped.** `xrun rate 0/hour` — the
+457/hour reading this morning was the dead NVIDIA sink, not a perf problem.
+SuperDirt: `PRELOAD: 132/132 banks OK in 6.8 s`, server ready.
+
+Fixed today, all pushed (a606d99): the audio (laptop card back on HiFi, NVIDIA
+pin retired), the LCXL3 driver (started; its 1077 failures were a resolver
+looking for the ORIGINAL board's name), midiviz (v3 map moved into the grid, so
+any reader of the board is right), the gate's painter probe (was skipping every
+cold run), gig-log's MIDI leg (had never bound a port in nine sessions), and a
+stale-build detector.
+
+### The three remaining warns, none blocking
+
+- **audio profiles** — `50-alsa-config.conf` is 0.5 format on an 0.4.17
+  install, so it is dead config that looks like protection. Post-gig.
+- **cpu governor** — daytime mode on a work laptop. `gig-up` does the perf pass.
+- **monitor path** — headphones fold shows 2/28 links, d2-d14 unreachable
+  without Ardour. Expected with Ardour closed; the rig routes through it.
+
+### YOURS, and it is the only thing left
+
+- [ ] **The 2h arc, with Ardour recording.** This afternoon, or tonight after
+      the speaker dinner. Never once run. Everything else is green.
+- [ ] **Plug the UMC202HD for the last stretch** and run
+      `tools/check-audio-graph.sh` with it present. Thursday's output path, and
+      the only one nobody has tested — the same UCM failure that ate the sof
+      card's HiFi can hit the UMC's when it enumerates.
+- [ ] **Master fader**: `check-mix` reads the SAVED session, and Ardour OSC is
+      still off, so Ctrl+S before trusting a green fader line.
+- [ ] After the run: the MIDI log is now real. `~/.local/share/parvagues/gig-log/`
+      carries `cc` records with `n / v0 / v1 / lo / hi` per control per second,
+      in corpus numbering — so "minute 23:30 the bass is too saturated" is
+      answerable from the file afterwards.