dangernoodle-io / breadboard / 29776514021

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feat: bb_serialize_json streaming compose render (B1-1097) (#964)

- bb_serialize_json_stream_compose_render() takes a groups[] array
  (bb_serialize_compose_group_t: entries/n/shape per group), driving
  one bb_serialize_compose_walk() call per group inside a single root
  framing -- lets a caller mix shapes in one document (e.g. a RAW
  root-descriptor group plus OBJECT-wrapped named sections), which no
  single bb_serialize_compose_walk() call can express on its own
  (shape is uniform across its entries[]); mirrors
  bb_serialize_json_stream_render() otherwise (same flush buffer,
  abort/flush_failed contract, error semantics)
- bb_http_serialize_stream_compose() bridges it to bb_http_server,
  paralleling bb_http_serialize_stream(), taking groups[]/n_groups
- additive only: no new buffer, no new Kconfig knob, no changes to the
  primitives being wrapped (bb_serialize_compose_walk() itself needs
  no change -- the caller already owns root framing)
- bb_serialize_compose_group_t relocated to bb_serialize_compose.h
  (next to bb_serialize_compose_entry_t/bb_serialize_compose_shape_t):
  it is pure grouping vocabulary over entries+shape, format-agnostic,
  not JSON-specific -- leaving it JSON-scoped would force the next
  mixed-shape backend (logfmt, console, openapi, manifest) to either
  depend on bb_serialize_json or hand-roll a duplicate struct


Claude-Session: https://claude.ai/code/session_01FyQRchhnzygp3vMqmm7QWs

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

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