docs(gig): the third pass, and what d9 was actually doing

A conformance check run before the step that breaks conformance proves nothing
— the compaction moved 150 orbits and left 202 of their controls behind, and
the tool said '0 move' about a file that needed four.

Also records the answer to PLN's own d9 note: its attack was riding d12's
Ardour-learned level knob, and its mask shares d6's gate with no legal
alternative, because d9 has no button slot in the grid at all.

TODO_GIG.md

@@ -197,6 +197,25 @@ Open, highest leverage first:
 - [x] **Orbit compaction DONE** (f6be520) — 150 moves in 133 files, band {5,6,7} derived
   from the family maps so a move is inaudible; d4 (bass) and d8 (percs) never touched.
   7 orbits refused for carrying an explicit `# orbit N`.
+- [x] **THIRD PASS: the controls follow the orbits** (ca21d6b) — compaction renames a `dN`
+  but does not move that orbit's knobs, so 202 controls in 84 files were left on the column
+  of an orbit that had moved away. The two tools are one job in two passes. Found by
+  accident: `ete_a_mauerpark` reported "0 move" right after the compaction and 4 the moment
+  something else made me re-plan it — **a conformance check run before the step that breaks
+  conformance proves nothing**. Re-plan now 0 across all 703; third full sweep, zero verdict
+  changes; the 17-track set re-validated after, all OK, pvlint 0 errors.
+- [x] **`ete_a_mauerpark` d9 — PLN's "[confirm d9 effects]" answered.** d9 gets exactly ONE
+  knob in the grid (A5 = ^17) and drives four effects. `att` was on **^16 = A4 = d12's
+  Ardour-learned LEVEL knob**, so one knob moved an Ardour track gain AND d9's attack — the
+  CC77-goes-to-silence class. Moved to ^20, idle in this track, verified.
+  `lesliebus` on ^18 and `chorus` on ^19 borrow d10's and d11's fx knobs; both orbits are
+  undeclared here so they work, they are just not d9's.
+  - [ ] **STILL OPEN, and structural:** d9's `mask` rides **^58 = BT6 = d6's own gate**, and
+    d6 IS declared in this track — one button, two orbits. d9 has **no button slot at all**
+    in the grid, so there is no legal destination: this is gSel work, not a rename. pvlint
+    does not flag it because PV008 only looks at orbits 1-8.
+- [x] **`sept1` "TODO fix to new controller" is already done** — 0 moves, 0 overflow, 0
+  FIXMEs after the remap. If it still feels wrong at the desk it is not a mapping problem.
 - [x] **Both migrations verified against the baseline** — `silent-eval --seeded` re-run
   over all 703 files after each, diffed per file against
   `docs/2026-09-22-catalog-playability.tsv`: **zero verdict changes, twice**. 597 playable,