kaidokert / rm32-private / 25776547587

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Fix stuck rotor stall rate: reset interval timer after stall detection

Root cause: rm32 didn't reset interval_timer_count after stall
registration. C calls SET_INTERVAL_TIMER_COUNT(0) in zcfoundroutine(),
throttling stall detection to one increment per 22.5ms re-arm cycle.
Without the reset, rm32 incremented bemf_timeout_happened at main-loop
rate (~8kHz), racing past the threshold during normal startup before
BEMF could lock — motor could never spin up with stuck_rotor_protection
enabled.

Fix: main_state stall handler sets interval_timer_reset flag. ISR picks
it up AFTER publishing the current timer value, resets the HAL timer to
0. Next tick publishes 0, needs 45000+ ticks to reach threshold again.

Add stuck_rotor_rate.txt regression vector: sets interval_timer=50000
once, ticks freely without per-tick re-injection. Verifies motor stays
alive (C-parity: timer reset throttles stall counter).

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