dangernoodle-io / TaipanMiner / 24913006729

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fix(asic): coalesce chip quiesce/resume; bump pause ACK timeout to 15s (#182)

bb_ota_pull triggered back-to-back pause cycles (background check then
install). after the check's resume, our TA-216 chip_resume runs the
full ~8s bm1368_chip_init freq ramp. during the ramp, asic_task can't
call mining_pause_check, so when the install-phase pause fired the
5s ACK window expired and B1-63 aborted the OTA.

two fixes:

- asic_task top-of-loop pause handling coalesces quiesce/resume across
  rapid-fire pauses. chip stays in CMD_INACTIVE through the entire
  check→install sequence; chip_resume (the expensive ramp) runs only
  once, when we're genuinely clear.
- mining.c: pause ACK timeout 5s → 15s. covers bm1370-at-650-mhz
  worst-case ramp (~10s) if fix #1's coalesce misses the race. belt-
  and-suspenders, not the primary fix.

observed symptom: "mining pause acknowledge timeout, resetting state"
followed by "bb_ota_pull: mining pause failed — aborting OTA" mid-
otherwise-healthy update path. expected result: check+install now
completes without aborts.

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