fix(docking): dock automatically; repair cards parked on pro-audio

Bernardo's retest on the AMD dev box. Two of the four reports were never
running the new code — both watchers are Hyprland `exec-once`, so a
`nomarchy-home` switch leaves the old processes alive until relogin; only
`nomarchy-dock-audio`, a user service, had picked the fix up. The journal
showed the old watcher's `event=monitoradded` next to the new audio tool's
`result=no-available-sink`, which is what gave it away. The other two were
real.

Automatic dock mode did not exist. The watcher auto-*undocked* when the last
external left, but on plug it only ever matched a display profile — and with
no profile saved and displayProfileAuto unset it did nothing at all, while
`Dock mode` was reachable only from the menu. Half the pair being automatic
is what made the dock feel broken: the session came home by itself but never
left. Mirror it, letting a matched profile win as the more specific layout.

The BenQ's audio was unreachable by any means because WirePlumber had the
GPU's DisplayPort card pinned to `pro-audio`, whose raw `pro-output-N` sinks
carry no ports, no routing and no volume — so no sink matched, nothing was
selectable, and the profile is stored per card and so survived forever. The
monitor's own USB card is input-only (every profile has sinks: 0), leaving
DisplayPort as the only path to its speakers. Repair the card when a plug
finds nothing routable, which is both the symptom and the only moment worth
touching profiles: narrow to cards carrying an *available* HDMI/DP port —
the monitor asking for audio over the cable — so the internal analog card is
never touched and a considered pro-audio setup elsewhere survives.

Verified V2: checks.docking-ux and checks.dock-audio pass with guards for
both; the repair filter picks exactly the GPU card → HiFi against the dev
box's live graph, leaving the BenQ USB, internal analog and Bluetooth cards
alone. Hotplug itself still needs hardware — HARDWARE-QUEUE round 6, which
now leads with the relogin requirement that invalidated round 5.

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

agent/HARDWARE-QUEUE.md

@@ -54,6 +54,28 @@ the **T14s** (webcam case).
       `journalctl --user -t nomarchy-display-watch` should show
       `outputs-changed added=…`, and `-t nomarchy-dock-audio`
       `trigger=jack selected=…` on a headphone plug.
+
+      **Round 5 was itself run and failed (2026-07-14); this entry now covers
+      round 6.** Two of the four reports were never actually testing the fix:
+      both watchers are Hyprland `exec-once`, so `nomarchy-home` swaps the
+      config but leaves the *old* processes running — only `nomarchy-dock-audio`
+      (a user service) had picked up new code. **Relogin is mandatory before
+      testing either watcher**; confirm with `tr '\0' '\n' < /proc/$(pgrep -f
+      bin/nomarchy-display-profile-watch)/cmdline | sed -n 2p` and grep the
+      script for `outputs-changed`. The other two were real and are fixed in
+      the commit carrying this entry: automatic dock mode did not exist at all
+      (the watcher auto-*undocked* but only ever matched display profiles on
+      plug, and this box has none saved with `displayProfileAuto` unset, so
+      nothing happened — `Dock mode` was interactive-only), and the BenQ's
+      audio was unreachable because WirePlumber had `alsa_card.pci-0000_c3_00.1`
+      pinned to `pro-audio`, whose raw `pro-output-N` sinks have no ports and
+      no routing. The BenQ's own USB card is input-only (all profiles
+      `sinks: 0`), so DisplayPort is the only path to its speakers.
+      **Also check:** no display profile is saved, yet plugging the BenQ must
+      now dock by itself; and `journalctl --user -t nomarchy-dock-audio` shows
+      `repaired-card=alsa_card.pci-0000_c3_00.1 profile=HiFi` on the first
+      plug, after which audio reaches the monitor's speakers. A saved+matching
+      display profile must still win over auto-dock.
 - [ ] **Docking recovery round 4 (#100, closed-lid BenQ sequence)** — after
       updating to the commit carrying this entry, run `nomarchy-home` and
       relogin. With the lid open, put visible windows on at least workspaces