fix(idle): skip DPMS-off when docked (#127 mitigation)

Blanking the only live output in dock mode led to a brick where wake and
even VT switch failed. Skip hypridle's 10m dpms off when any laptop
internal (eDP/LVDS/DSI) is present but not enabled; lock at 5m remains.
Undocked still blanks. Document LATER revisit for intentional
DPMS-when-docked once wake is proven.

V1: nix flake check --no-build. V3: docked idle stays lit under lock.

agent/JOURNAL.md

@@ -19,6 +19,15 @@ Template:
 
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+## 2026-07-15 — #127 skip DPMS-off when docked (mitigation)
+- **Task:** Bernardo: no usable TTY on brick; prefer prevent over dump.
+- **Did:** hypridle 10m listener skips `dpms off` when an internal
+  (eDP/LVDS/DSI) is present-but-disabled; lock still at 5m. Documented
+  LATER “DPMS when docked” revisit. Dump/wake tools remain.
+- **Verified:** V0/V1 flake check. V3: HARDWARE-QUEUE mitigation check.
+- **Pending:** human docked idle past 10m → external lit under lock.
+- **Next suggestion:** V3 docked idle, or other queue.
+
 ## 2026-07-15 — #127 no-SSH dump + docked idle wake harden
 - **Task:** Tackle docked idle blackout without needing SSH mid-brick.
 - **Did:** `nomarchy-display-dump` / `nomarchy-display-wake`; undock always