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feat: telemetry SSOT phase 2 — migrate BB sources + Prometheus no-re-gather + wifi recovery fields (#587)

* feat: migrate bb_pub_fan/power/thermal/net_health onto telemetry-ssot gather+serialize

- bb_pub_fan: split gather (bb_fan_primary + bb_fan_snapshot + autofan telemetry)
  and serialize (inlined emit with null semantics); bb_pub_telem_sse | sinks
- bb_pub_power: split gather (bb_power_primary + bb_power_snapshot) and serialize
  (bb_power_emit + ts_ms); bb_pub_telem_sse | sinks
- bb_pub_thermal: split gather (bb_thermal_collect, skips when all absent) and
  serialize (inline soc/vr/asic/board with null semantics); bb_pub_telem_sse | sinks
- bb_net_health_espidf: split gather (bb_net_health_get_status) and serialize
  (bb_net_health_emit + ts_ms); bb_pub_telem_sse | sinks
- all four sources now gathered once per tick under s_tick_lock; rest/sse/sink
  share identical memoized bytes via bb_cache

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

* feat: migrate bb_pub_info onto telemetry-ssot (sinks-only, no sse)

- split gather (heap/flash/board/wifi/time fields into bb_info_snap_t ~360 bytes)
  and serialize (full bb_pub_info wire format with conditional psram/ota fields)
- registered with bb_pub_telem_sinks only (no sse — info is sink-only, same as
  legacy registration)
- bb_pub_telem_snap_max default raised 256 → 512: bb_info_snap_t is ~360 bytes,
  exceeding the previous default; c default and kconfig default both updated

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

* docs(prometheus): document no-re-gather guarantee for ssot metrics path

- add block comment above metrics_handler explaining that for every source
  migrated to bb_pub_register_telemetry, fn is _telem_adapter_sample which
  calls bb_cache_serialize_into — reads memoized snapshot, never re-gathers
- notes that the telemetry-rest-cache-read lint rule is satisfied because the
  handler does not call any live gather fns directly
- publisher health gauges are c... (continued)

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