dangernoodle-io / breadboard / 27803335134

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jae/bb metrics endpoint (#466)

* feat(bb_pub): add per-source liveness, source enumeration + metrics prefix (B1-295)

- per-source liveness fields: last_sample_ms / sampled_ever
- source enumeration API: bb_pub_source_count / bb_pub_source_info /
  bb_pub_ring_undersized (used by bb_telemetry's GET /api/metrics)
- Prometheus metric-name prefix owned here: CONFIG_BB_METRICS_PREFIX
  (Kconfig, default "bb"), bb_pub_set_metrics_prefix() /
  bb_pub_metrics_prefix() (RAM static defaulting to the Kconfig value),
  reset by bb_pub_test_reset()

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

* feat(bb_telemetry): add GET /api/telemetry/metrics Prometheus endpoint (B1-295)

exposes the live bb_pub telemetry contract as a prometheus scrape target — the pull-side complement to the mqtt push path, and the discoverability surface that makes silent source drops (e.g. an undersized always-on ring) visible from the device.

- GET /api/telemetry/metrics -> prometheus exposition (live values)
- ?format=json -> aggregated snapshot {host,ts_ms,sources,publisher}
- ?schema[&format=json|prom] -> the metric contract, no values
- metric prefix via CONFIG_BB_METRICS_PREFIX + bb_pub_set_metrics_prefix()
- lives in bb_telemetry (not a new component) per decision #402

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

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

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