dangernoodle-io / breadboard / 28354587914

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feat(openapi): add components/schemas + $ref and per-topic SSE schema registry (#597)

- add bb_openapi_register_schema / bb_openapi_register_topic_schema API
  for registering named OpenAPI component schemas at runtime
- emitter (both bb_openapi_emit and bb_openapi_emit_stream) populates
  top-level components/schemas from the registry; streaming path emits
  one literal at a time to preserve bounded per-op allocation (B1-375)
- SSE routes with schema=NULL + content_type=text/event-stream now
  synthesize a oneOf of $ref entries at emit time — covers /api/events
  generically; new topics auto-appear without route descriptor changes
- bb_log_event registers LogEvent schema (ts, level enum, tag, msg)
  and sse_topic="log" on auto-attach, closing #588 regression
- bb_wifi_routes registers WifiInfo component and uses
  {"$ref":"#/components/schemas/WifiInfo"} in the GET /api/wifi 200
  response descriptor
- host_tools/emit_openapi: fix cmake for homebrew cJSON layout (cjson
  target name, include path cjson/ subdirectory, missing bb_core /
  platform headers and http sources)
- test/test_host/test_sse_schema_fidelity.c: registry API, log payload
  validation against schema, emit has components/schemas, events oneOf
  synthesis, stream path coverage; 9 new tests covering OOM paths,
  mixed-sse_topic skip, multi-schema stream comma separator, and
  schema_get null-out guard (2841 total; 100% branch coverage)
- test_openapi_emit.c extended: $ref passthrough + components section
  tests; test_main.c wired with setUp registry clear
- Makefile gcovr: exclude .claude worktrees + merge-mode-functions to
  avoid stale gcda merge conflicts in local dev

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

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