dangernoodle-io / breadboard / 25926839565

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feat(bb_update_check): periodic release check + mDNS publish (B1-195) (#231)

New component that polls a configurable release manifest URL, compares
the returned version against bb_system_get_version(), and on state
change posts the update.available bb_event topic and updates the mDNS
TXT key update=<value> (unknown pre-check, none up to date, <tag> when
newer). The default manifest parser is bb_release_manifest_parse_github;
consumers swap it via bb_update_check_set_parser(fn) for GitLab,
Jenkins, S3, or private artifact-server manifests.

- public API: bb_update_check_init/set_releases_url/set_parser/now/
  get_status
- ESP-IDF: bb_http_client fetch + FreeRTOS worker + bb_timer + auto-
  registered GET /api/update/status route via BB_REGISTRY_REGISTER_N
- Arduino: every setter returns BB_ERR_UNSUPPORTED (CC3000 / Cortex-M
  have no general HTTPS client)
- host: hermetic tests via bb_http_client mock-response hook; 23 Unity
  tests covering init/accessors, semver edges (dev-prefixed), transport
  / parse / HTTP-error sticky failures, post_initial publish, custom
  parser override, available<->none transitions
- smoke: bb_update_check_init(NULL) on ESP-IDF envs only; no URL set so
  polling stays idle and bb_update_check_now() returns
  BB_ERR_INVALID_STATE cleanly
- docs: CLAUDE.md "Update check" section + README components row

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