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feat: telemetry SSOT — bb_cache single store + bb_pub sampler/sink-driver (memoized serialize-once) (#585)

* feat(bb_cache): add register_ex with capability flags + bump max topics to 32

- add bb_cache_flags_t typedef + BB_CACHE_FLAG_NONE / BB_CACHE_FLAG_SSE constants
- add bb_cache_register_ex(topic, snapshot, snap_size, serialize, flags)
- re-implement bb_cache_register as bb_cache_register_ex(..., BB_CACHE_FLAG_SSE)
  (zero behaviour change for all existing callers)
- only call bb_event_topic_register when flags & BB_CACHE_FLAG_SSE; sink-only
  topics skip it, saving an event-topic slot per source
- bump BB_CACHE_MAX_TOPICS default 8→32 in both Kconfig and C header fallback;
  update platformio.ini to match
- update bb_cache_reset_for_test to clear the new flags field
- update test_bb_cache_registry_full to generate topics dynamically so it works
  at any BB_CACHE_MAX_TOPICS value

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* bb_pub: telemetry registry + sampler + sink-driver + B1-388 removal

- add bb_pub_gather_fn, bb_pub_telemetry_flags_t, bb_pub_telemetry_cfg_t to bb_pub.h
- add bb_pub_register_telemetry(): registers gather fn + serializer in telem table,
  calls bb_cache_register_ex with SSE/NONE flag, and installs a back-compat adapter
  source (telem_managed=true) so sample_into / source_info still enumerate it
- add telem Phase 1 in bb_pub_tick_once (under s_tick_lock): gather each telem
  source into s_snap_scratch, store in bb_cache via bb_cache_update, mark for fan-out
- add telem Phase 2 (outside lock): bb_cache_post for SSE topics; bb_pub_publish_from_cache
  for SINKS topics (reads cached snapshot, serializes once, fans to all sinks)
- B1-388: refactor tick_payload_t from json[MAX_SINKS] to single json + subscribed[];
  serialize once per source, deliver same payload to all sinks; transport/tls fields
  omitted from payloads (remain on bb_pub_sink_t for /meta and /api/info)
- gate legacy per-sink transport/tls injectio... (continued)

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