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feat(adopt): breadboard v0.43.1 + esp_timer→bb_timer extraction (timestamps + ota one-shot) (#469)

- bump scripts/fetch_breadboard.py VERSION to v0.43.1 (bb_timer one-shot API + host backend POSIX scoping for strict -std=c99 consumers)

app-logic timestamp extraction:
- replace direct esp_timer_get_time() with bb_timer_now_us() at app-logic sites (stratum_io, knot, mining_pool_stats, asic_task, main, routes, + the two mining.c app accessors)
- bb_timer added to REQUIRES for stratum/knot/asic/webui + the native test env
- intentionally EXEMPT: hw sha drivers (sha256_hw_*.c, sha256.c) + the mine_nonce_range IRAM hot loop — esp-coupled drivers per rules/esp-idf.md, and wrapping the timer in the per-nonce path adds a non-iram call + perturbs the timing it measures (full-sweep consolidation tracked separately)
- esp_timer.h includes dropped from files that no longer reference esp_timer_*

ota_validator one-shot extraction:
- ota_validator_espidf: replace esp_timer_create/start_once/stop/delete with bb_timer_oneshot_* — removes the last esp_timer leak in the validator path; ota_validator REQUIRES esp_timer -> bb_timer
- drops the trampoline + heap timer_ctx_t the old esp_timer path leaked per timer (esp_timer has no get-arg API); bb_timer_oneshot stores cb+arg internally, so the ota callback passes straight through — leak gone

on-device validated: wroom32 mark-valid timer armed on stratum-auth, ota_validated flips true on first share (one-shot path); app-logic timestamp swap is behavior-identical (same source under the hood)
note: the thin ota_validator ops-table seam over bb_timer/bb_ota is now redundant — tracked for removal in TA-406

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

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