dangernoodle-io / breadboard / 29181819966

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feat: add bb_serialize_json bounded-buffer JSON emit backend (#828)

- hand-rolled, no-heap, bounded-buffer JSON writer implementing bb_serialize_emit_t
- deterministic fixed-decimal f64 formatting (scale-and-round, no snprintf) + BB_SERIALIZE_JSON_F64_DECIMALS tuning knob
- full JSON string escaping (control chars, quote, backslash; raw UTF-8 passthrough)
- all-or-nothing overflow contract (BB_ERR_NO_SPACE, never partial JSON)
- bb_serialize_json_bound() computable worst-case sizing helper
- golden byte-identity host tests, 100% line+branch coverage on bb_serialize_json.c
- registered in bbtool.toml core (host) + smoke (espidf link-proof) component sets

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

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