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feat(bb_pool,bb_event_routes): per-slot lifecycle callbacks + non-blocking SSE reap-gate (B1-479, B1-484) (#681)

- bb_pool: SLOTS macro gains optional on_acquire/on_release per-slot
  callbacks and async slot_reusable/slot_reap hooks for consumers that
  need deferred cleanup before a slot can be reacquired
- SSE per-client slots migrated to bb_pool-with-callbacks, replacing
  the ad hoc acquire/release bookkeeping in bb_event_routes_espidf
- exiting SSE writer task tail now gives a completion semaphore then
  vTaskSuspend(NULL) instead of self-deleting, so the owning slot can
  safely confirm task exit before reuse
- events_handler fast-returns 503 when a slot is not yet reusable
  instead of blocking on task teardown
- bb_pub host tests continue to pass with no callbacks (backward
  compatible default)
- fix: SSE static-arena sizing now scales with MAX_CLIENTS (mirrors
  bb_pool's own SLOTS-mode math + a runtime cross-check against
  bb_pool_arena_size_needed()) instead of a flat 256-byte allowance
  that silently overflowed above the Kconfig default capacity
- fix: bb_pool_release's free_top corruption guard now runs before
  the acquired-bitmap clear and on_release callback, so a corrupted
  free_top fails atomically with no side effects
- extract sse_bundle_decide() (components/bb_event_routes/src/) as a
  pure, host-tested state->action mapping for the SSE task-bundle
  reuse decision, so the ESP-IDF-only reusable/reap callbacks delegate
  to logic Coveralls can see

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