dangernoodle-io / breadboard / 24968767699

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feat(bb_manifest): /api/manifest endpoint exposing nvs + mdns keyspaces (#97)

Companion to bb_openapi (#96): describes the consumer-registered NVS
keyspace and mDNS TXT keyset so external tools (custom flashers, fleet
provisioners, third-party integrators) can write valid configs and
filter mDNS results without grepping firmware source.

- public api: bb_manifest_nv_t, bb_manifest_mdns_t,
  bb_manifest_register_nv, bb_manifest_register_mdns,
  bb_manifest_emit, bb_manifest_register_route, bb_manifest_clear.
- portable bb_manifest_emit.c uses bb_json only; emits the document
  shape documented in the plan (nvs by namespace, mdns by service,
  txt values as json arrays split from "|"-separated literals).
- host tests cover empty registry, single/multi namespace + service,
  null/string defaults, null/array values, registry overflow, and
  every alloc cleanup path via bb_json_host_force_alloc_fail_after.
- opt-in component (REQUIRES bb_manifest); not flashed unless a
  consumer asks for it.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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