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>

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