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fix(bb_ring_espidf): wire SPIRAM allocator into smoke + make transitive via bb_event_ring_espidf (telemetry review) (#446)

- bug: bb_ring_espidf (EARLY-registered SPIRAM allocator for bb_ring) was not
  wired into the smoke example or pulled in transitively, so event-ring and
  bb_pub store-and-forward ring buffers allocated from internal SRAM on PSRAM
  boards instead of SPIRAM — wasting the heap we tuned
- examples/smoke/CMakeLists.txt: add bb_ring_espidf to EXTRA_COMPONENT_DIRS
  alongside bb_event_ring_espidf and bb_event_routes_espidf
- examples/smoke/main/CMakeLists.txt: add bb_ring_espidf to SMOKE_REQUIRES so
  the EARLY allocator override is linked and force-registered
- platform/espidf/bb_event_ring_espidf/CMakeLists.txt: add bb_ring_espidf to
  PRIV_REQUIRES so any consumer pulling in bb_event_ring_espidf transitively
  gets the SPIRAM allocator — durable fix, downstreams (TM, snugfeather) cannot
  miss it
- hardware-verify at #42: rings landing in SPIRAM on PSRAM boards confirmed via
  heap telemetry on device (172.16.1.81)

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

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