dangernoodle-io / TaipanMiner / 25061162165

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refactor(ota_validator): inject HW ops for host-testable executor (TA-234 phase A) (#239)

the executor (timer arm/cancel + bb_ota mark-valid) had zero host coverage;
all three execution paths (timer arm, share-accepted stop+mark, timer-fired
mark) are now covered by mocked ops in test_ota_validator_io.c.

addresses KB note: "OTA rollback already enabled but mark-valid fires too early"
-- the mark-valid contract is now testable without hardware.

- new ota_timer_ops_t / ota_mark_valid_ops_t in ota_validator_io.h
- production bindings in ota_validator_espidf.c (esp_timer + bb_ota wrappers)
- ota_validator.c rewritten to dispatch through ops; no esp_timer.h include
- ota_validator_init() wired in main.c before start_mining()
- ota_validator.c added to native build_src_filter; espidf.c excluded
- 8 new io-shell tests; 373 total, all green; coverage 97%
- pure state machine (ota_validator_state.c) unchanged

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

521 of 631 branches covered (82.57%)

Branch coverage included in aggregate %.

26 of 26 new or added lines in 1 file covered. (100.0%)

1143 of 1177 relevant lines covered (97.11%)

353452.08 hits per line