imu in the runtime and repo lists

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

docs/ORIN-RUNTIME.md

@@ -17,7 +17,7 @@ repo, so it lives in the hub rather than in any one of them.
   ─────────────────────────────────────────────────────────
   serving        svc-gw, svc-nav
   processing     decoder, recorder
-  acquisition    can-bridge, obd-poller, gnss
+  acquisition    can-bridge, obd-poller, gnss, imu
   bus            mosquitto
   ─────────────────────────────────────────────────────────
   host           kernel modules, gpsd, ALSA, network         orin-nano-env-setup
@@ -68,7 +68,7 @@ Ordered by what is lost if a tier is late.
 |---|---|---|
 | 0 | kernel modules, gpsd, network | Host layer; nothing of ours can precede it |
 | 1 | `mosquitto`, `can-bridge`, `recorder` | **Data is lost if late.** Must reach ready fastest |
-| 2 | `decoder`, `gnss`, `obd-poller`, `orin-status` | Derive from tier 1; a late start loses nothing |
+| 2 | `decoder`, `gnss`, `imu`, `obd-poller`, `orin-status` | Derive from tier 1; a late start loses nothing |
 | 3 | `svc-gw`, `svc-nav`, `svc-vision` | Serving; a display can wait |
 | 4 | voice — ASR, TTS | Interactive; seconds late is harmless |