dangernoodle-io / TaipanMiner / 28210965689

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feat(ota): convert non-PSRAM boards to boot-mode OTA (reverses B1-301) (#568)

Adds sdkconfig/ota-boot fragment enabling STRATEGY_BOOT + boot-time
progress/status HTTP + apply-fallback check.

Wires the fragment into SDKCONFIG_DEFAULTS for all non-PSRAM envs
(wroom32, wroom32-cyd, tdongle-s3, c3-supermini, s2-mini).  S2 was
already on boot-mode; migrating it onto the shared fragment removes the
now-redundant per-board copies of those four keys.

Re-gates the boot-mode branch in src/main.c from the removed
BOARD_OTA_BOOT_MODE board-header define to CONFIG_BB_OTA_STRATEGY_BOOT
so the preprocessor gate follows the sdkconfig truth.

Rationale: non-PSRAM boards have ~20-40 KB less available heap than
PSRAM boards.  Pull-OTA runs a persistent background task and TLS
session that consumes that headroom; boot-mode OTA reclaims it by doing
the update before the mining stack initialises.

Per-class HW validation is tracked separately.  Web-UI OTA gaps are
TA-442; push-OTA is the interim path until that lands.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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