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feat: add streaming JSON event scanner + ingest vtable to bb_serialize_json (#845)

- hand-rolled, library-free streaming JSON scanner; no cJSON, no jsmn
- `bb_serialize_json_ingest_t` vtable mirrors `bb_serialize_emit_t`; callbacks return `bb_err_t` so a sink can early-stop
- bounded (`_scan_bounded`) and streaming (`_scan_begin`/`_feed`/`_end`) entry points share one grammar/depth state machine
- `bb_serialize_json_span_t` makes span provenance explicit (caller-stable / feed-scoped / scanner-scratch) so a sink can never mistake transient decoded-escape scratch for a durable slice of its own buffer
- keys, numbers and literals are reassembled through a shared bounded scratch; string values stream as spans with `is_final`
- full escape + \uXXXX + surrogate-pair decoding; depth reuses `BB_SERIALIZE_MAX_DEPTH`
- no heap; 384-byte scanner context


Claude-Session: https://claude.ai/code/session_01WcT1TPAV2UE4VeGuDL7K8p

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

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