fix(docking): make workspace and lid transitions atomic

Restore the old flake's external-only workspace handoff, protect closed-lid cable removal with a verified low-level logind inhibitor, and use monitor-added as the settled audio reprobe boundary.

Verified: V2 — nix flake check --no-build; docking-ux, option-docs, and template-sot checks; KVM tools/monitor-fallback.nix lifecycle test.

V3 pending: closed-lid BenQ round 4 in agent/HARDWARE-QUEUE.md.

agent/MEMORY.md

@@ -110,6 +110,15 @@ iteration would otherwise rediscover.
   check onto the whole return set or lazy attr access skips it.
 
 ## Design invariants
+- **Dock transitions are ordered safety operations (#100):** dock in one
+  `hyprctl --batch` (external on → every internal workspace moved → focus
+  external → internal off); undock enables internal *before* moving anything.
+  The Hyprland watcher, not a shell-pipeline subshell, owns a low-level
+  `handle-lid-switch` inhibitor until the lid is physically open; startup
+  cleans a validated stale process group. HDMI availability may appear only
+  as `change:sink`, so fresh `monitoradded` is the intent boundary for the
+  settled PipeWire/WirePlumber reprobe + sink pick; generic audio changes must
+  not override a manual in-dock speaker choice.
 - **Waybar status is never color-only** (item 28 sweep, iteration #69):
   every status module must distinguish its states by SHAPE (glyph) or
   presence (self-hide), never color alone — good/warn/bad collapse under