dangernoodle-io / breadboard / 25262681127

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fix(bb_http): recursive JSON streaming so large nested docs don't truncate (#175)

bb_http_resp_send_json previously serialized each top-level child as one
cJSON_PrintUnformatted string. For deeply nested values (e.g. the
/api/openapi.json `paths` object built by bb_openapi_emit), that single
contiguous allocation could return NULL even with plenty of free heap,
silently dropping the value and leaving an invalid `"paths":}` on the wire.

Stream containers recursively so each leaf serialize is small, fall back
to literal `null` on serialize failure to keep the document well-formed,
and always emit the chunked-encoding terminator even if a child errors so
the response finalizes cleanly. Fixes B1-130.

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