docs(hardware): round 6 settles 4 of 5 counts; headphones still untested

Bernardo's round 6 report plus the keyboard result confirms on hardware:
wallpaper on the external, automatic dock mode, audio reaching the
monitor, and the external keyboard prompting exactly once (was four).

That leaves headphone jack-follow as the only count from rounds 4-6 never
tested at all, so it gets its own entry rather than staying buried in a
list of settled ones. Fold it into the round 7 session — the dock is
already in hand and the two checks don't interfere.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agent/HARDWARE-QUEUE.md

@@ -62,10 +62,23 @@ the **T14s** (webcam case).
       a pass; `gave-up` means the panel could not be enabled at all and is a
       different fault — capture the artifacts listed in round 4 before
       changing state.
-- [ ] **Docking recovery round 5/6 (keyboard + headphone-jack counts,
-      2026-07-14)** — round 6 confirmed the dock/audio/wallpaper counts
-      below; the **keyboard-prompts-exactly-once** and **headphone
-      plug/unplug** counts were not reported either way and still need a run.
+- [ ] **Headphone jack-follow (last open count from rounds 4–6,
+      2026-07-14)** — rounds 4–6 opened five counts on the AMD dev box; four
+      are now **confirmed fixed on hardware** by round 6 (Bernardo): wallpaper
+      on the external, automatic dock mode, audio reaching the monitor, and
+      the external keyboard prompting **exactly once** (was four times). The
+      undock panel is round 7 above. This is the one count **never tested**:
+      plugging headphones had stopped moving audio to them, because a pinned
+      `default.configured.audio.sink` outranks the priority rules, which kills
+      jack-follow on UCM cards where the headphones are their own sink (fixed
+      in ce480f3's lineage, unverified). **Re-check:** docked and undocked,
+      plug and unplug headphones — audio must move to them and back each time,
+      and `journalctl --user -t nomarchy-dock-audio` must show `trigger=jack
+      selected=…` on each plug. Worth folding into the round 7 session: the
+      dock is already in hand and the two don't interfere.
+
+      **Historical detail for the four settled counts** (kept only until
+      round 7 closes; the fixes themselves are in the log):
       — round 4 was run on the AMD dev box and **failed on four counts**
       (Bernardo): no wallpaper on the external monitor, no automatic dock
       mode (System › Display had to be used by hand), audio staying on the