dangernoodle-io / breadboard / 28753600268

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feat: add bb_attrs + bb_filter (pure projection primitive) (#743)

- bb_attrs: intrusive attrs header (priority/kind/tag_mask/delivery_class)
  elements embed for filter/collection membership, recovered via
  bb_attrs_container_of (Linux container_of/offsetof idiom); no type_id
  field (YAGNI, no heterogeneous collection consumer exists yet)
- bb_filter: pure projection over bb_attrs elements — bb_filter_select()
  gates by priority/kind/tag/min_delivery, stable-sorts by priority,
  pressure-sheds DEFERRABLE before MUST (MUST never shed by pressure),
  truncates to max_count; bb_filter_emit_decide() is the
  delayed-not-dropped NOW/DEFER/DROP FSM (MUST never DROP)
- pressure is a bare input param on both APIs; no bb_transport_health
  wiring — documented as a deferred seam in the header and README
- 100% line + branch host coverage on both components (gcc-16 shim)
- READMEs for both new components per KB#680 doc taxonomy

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