dangernoodle-io / breadboard / 27253655275

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feat(bb_ota_boot): gated on-demand update-check + /api/update/status for boot-mode boards (#379)

- factor bb_update_check_emit_status_json (+ outcome_str) out of
  bb_update_check_espidf.c into bb_update_check_common.c so it compiles
  on both host and esp-idf; expose in public bb_update_check.h; have the
  persistent status_handler delegate to it
- add CONFIG_BB_OTA_BOOT_STATUS_HTTP Kconfig bool (default n): when set,
  bb_ota_boot_init registers GET /api/update/status and POST /api/update/check
  on the main httpd via the normal registry tier
- GET /api/update/status delegates to bb_update_check_emit_status_json;
  identical JSON shape to the persistent worker route (public contract for
  taipan-cli + webui unchanged)
- POST /api/update/check guards against low heap (mirrors
  CONFIG_BB_OTA_PULL_MIN_HEAP_BLOCK_BYTES, default 9216), returns 503
  {"error":"insufficient_heap"} if below threshold; otherwise spawns a
  transient BB_HTTP_CLIENT_TASK_STACK fat-stack task calling
  bb_update_check_now() then vTaskDelete; responds 202 {"status":"checking"}
  immediately — client polls GET /api/update/status
- stash releases_url/board from bb_ota_boot_run_if_pending into file-scope
  statics; status_check_ensure_init() lazily configures bb_update_check once
  url is known; idempotent; boot-time run_if_pending pull path unchanged
- add heap + freertos to bb_ota_boot PRIV_REQUIRES; no new esp_*.h in
  public headers
- 7 new host tests for bb_update_check_emit_status_json via
  bb_http_host_capture_* harness; all 1623 tests pass
- smoke env esp32-boot-status (BB_OTA_STRATEGY_BOOT + BB_OTA_BOOT_STATUS_HTTP)
  links and links cleanly; make smoke-esp32-boot-status target added

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

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