awning: current-sensing auto-retract + true CLOSED state; drop useless OPEN jog

Motion is hold-to-run (one authed opcode runs the motor ~1s). Reproduce the OEM
movement session -- auth once, then stream the opcode @110ms + a page-44
keepalive @510ms -- to sustain continuous retract, and watch node-75 page-3
motor current at 20Hz to stop at the fully-closed stall (~4200 vs ~<1550
running), then mark the cover CLOSED. Backstops: 70s timeout, motion-lost
detector, hold-to-run stop-on-silence. Proven live at the camper 2026-07-01.

- esphome: awning_auto_retract script + 100ms streamer interval + case-0x75
  stall gate + "Awning Motor Current" sensor. Cover CLOSE=auto-retract,
  STOP=abort. Removed open_action (1s jog is useless, no safe timed auto-open).
- bridge: optimistic:true keeps the home HA cover assumed-state so retract is
  always pressable (was greyed when closed); payload_open:null drops OPEN on the
  home (primary) dashboard. Also synced the 6h->15min discovery-cadence drift.
- captures + README: full-retract stall profile and the live auto-retract test.

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

canbus/ha/mqtt_bridge_onecontrol.yaml

@@ -11,7 +11,11 @@
 # Repo copy:    canbus/ha/mqtt_bridge_onecontrol.yaml
 
 automation:
-  # --- MQTT Discovery publish on startup / reload / every 6h ---
+  # --- MQTT Discovery + state republish on startup / reload / every 15 min ---
+  # The 15-min cadence (was 6h) heals stale retained switch states when an
+  # on-change forward publish is lost during a roof-AP/MQTT link flap — the
+  # weak-link failure that left home showing Exterior off while the camper
+  # was on (2026-06-14). Config republishes are idempotent (HA dedupes).
   - id: campsite_mqtt_discovery
     alias: "MQTT Bridge: Publish Discovery"
     triggers:
@@ -20,7 +24,7 @@ automation:
       - trigger: event
         event_type: automation_reloaded
       - trigger: time_pattern
-        hours: "/6"
+        minutes: "/15"
     actions:
       - delay: "00:00:05"
       - action: mqtt.publish
@@ -212,6 +216,8 @@ automation:
              "unique_id": "campsite_awning",
              "state_topic": "campsite/cover/awning/state",
              "command_topic": "campsite/cover/awning/set",
+             "optimistic": true,
+             "payload_open": null,
              "device_class": "awning",
              "availability_topic": "campsite/onecontrol/availability",
              "device": {"identifiers": ["campsite_onecontrol"]}}