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26f8d1fa72
Every boot waited the full 180 s OCXO warmup soak — even an IWDG/SYSRESETREQ reset that takes seconds and leaves the OCXO oven hot lost three minutes of bringup time. Added BKPSRAM slot 3 (magic 0xCA1C1F1E) with warmup_persist_set/check helpers next to the existing MCU-A2/A7 BKPSRAM block. Cold-boot path now arms the flag at the end of the full 180 s soak; subsequent boots that find the flag still set know the OCXO oven is still hot and the crystal is settled, so they wait 5 s and move on. Power-cycle clears BKPSRAM and forces the full soak again — safe default, operator can't accidentally skip the warmup by yanking and re-applying power. Added test_mcu_a4_ocxo_warm_restart (7 cases): cold boot soaks 180 s and sets the flag; warm reset is 5 s; 5 consecutive warm resets stay fast; power-cycle restores the cold path; cold-after-power-cycle re-arms the bypass; pre-fix regression confirms 10 warm restarts save 1750 s vs the old always-180-s path. MCU regression now 82/82.