Link drops: restoring PD costs ~2.2 s with the tablet awake

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -149,7 +149,7 @@ re-dialling is the client's job. Noticing the loss and redelivering is the Orin'
 
 Measured on the USB path (tablet ↔ PD hub ↔ Orin, 2026-10-09): cutting PD power
 resets the hub's data port, and the link is back within ~3.5 s with no
-intervention. In the car that happens at every ignition change, cranking
+intervention; restoring it costs ~2.2 s (a gadget reconnect, no detach). In the car that happens at every ignition change, cranking
 included. Longer outages measured early on were the tablet sleeping on battery,
 not the link. Design for drops as normal operation. Requirements, not yet implemented:
 
@@ -161,7 +161,7 @@ not the link. Design for drops as normal operation. Requirements, not yet implem
   nothing.
 - **The app keeps the tablet awake while it is the display.** Off charger, Android
   suspends about a minute after screen-off. Then the link is gone in every way that
-  matters. Kept awake, a PD change costs only ~3.5 s (measured).
+  matters. Kept awake, a PD change costs only 2–3.5 s (measured).
 - **Downstream (latest-wins):** unchanged. On reconnect, push current state; no
   resend, since stale samples are worthless.
 - **Reliable channel (TTS chunks, acknowledgements):** pending items survive a