dangernoodle-io / breadboard / 25984162124

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feat(bb_update_check): streaming fetch + parser; eliminate body buffer (#244)

- add bb_http_client_get_stream: chunk callback API mirroring existing
  bb_http_client_get retry/TLS pattern; 2 KB chunk buffer on ESP-IDF,
  ~256 B chunk replay on host mock
- add bb_release_manifest_parse_github_stream_{begin,feed,end}: resumable
  byte-at-a-time state machine; handles key/value/asset-object splits across
  chunk boundaries; same matching rule as buffered parser
- rewire bb_update_check_run_one to use the streaming path by default:
  no per-fetch body buffer allocation; stack-only parser state (~400 B)
- custom parser path falls back to a local 16 KB heap alloc (freed after call)
- remove BB_UPDATE_CHECK_BODY_SIZE Kconfig and s_body/s_body_cap state
- add 24 streaming parser tests (1-byte, 7-byte, 256-byte, whole-body chunks)
- add 11 bb_http_client_get_stream tests (host mock)
- all 750 host tests pass (715 prior + 35 new)

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