dangernoodle-io / breadboard / 29180796392

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feat: add bb_serialize core (descriptor + walker + emit seam) (#827)

- add shared bb_type_t/bb_format_t enums to bb_core (bb_type.h, bb_format.h)
- add bb_serialize component: field/descriptor tables + pure walker
  (bb_serialize_walk, bb_serialize_desc_find), no heap/locks/io
- support scalar (i64/u64/f64/bool), embedded bounded string, ptr+len
  string, nested object, and generic array (string or object elements)
  field types, plus a per-field present-gate predicate
- emit vtable carries format_id as the format-neutral swap seam; no
  wire-format backend ships in this component
- wire bb_serialize into bbtool.toml's host (capability.core) and
  smoke (capability.smoke) component manifests -- host tests exercise
  the walker, smoke proves it links (unwired, no init marker)
- add host recording-emit fidelity tests covering flat/nested/gated
  fields, string bounds, str_n null/empty, string and object arrays
  (incl. empty/null-guarded), depth guard, and desc_find

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