dangernoodle-io / breadboard / 29616601386

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feat: add bb_queue byte-budget + age-eviction backpressure (#910)

- new bb_core bb_age module: pure FRESH/STALE/EVICT age classifier
  lifted out of bb_cache's evaluator, shared by any age-based eviction
- bb_cache_evaluate_age() becomes a thin wrapper over bb_age_classify(),
  public bb_cache_entry_state_t API unchanged (back-compat)
- bb_queue_create_ex()/bb_queue_cfg_t add an optional total-byte budget
  (max_bytes) and age-based eviction (max_age_ms); bb_queue_create()
  stays a thin wrapper with both disabled (zero behavior change)
- bb_queue_push() age-sweeps expired entries relative to its own
  timestamp, rejects outright when a single entry can never fit the
  byte budget, then evicts oldest entries in a bounded loop (N>1 when
  needed) to satisfy both the entry-count and byte-budget space checks
- new bb_queue_evict_expired() for an explicit, caller-driven sweep
- host tests for every new branch (budget evict/reject, multi-entry
  eviction, age sweep on push, explicit sweep, disabled-path canary,
  create_ex validation) plus a bb_age boundary-table test mirroring
  bb_cache's existing evaluator tests

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