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fix(asic): match AxeOS TPS546 protection — skip VOUT_UV fault response, SYNC_CONFIG 0xD0 (#548)

bitaxes (BM1368 + BM1370) were tripping VCORE off on normal load
transients because TM wrote VOUT_UV_FAULT_RESPONSE=0xBF (shutdown+hiccup,
bb #391, first shipped v0.29.0). AxeOS writes the VOUT_UV *limit* but
never the response — so it never shuts down on a transient VOUT_UV.

- vout_uv_fault_response 0xBF -> 0 (skip the 0x45 write; keep chip default)
- sync_config 0x10 -> 0xD0 (AxeOS single-phase standalone parity)

Validated on a bitaxe-403 (mined past 9 min, no 0x0840 STATUS_WORD
cutout). Ref TA-431.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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