* feat(telemetry): carry observation volume on rollups so cache-value survives migration
The context-cache-value, per-user-savings, and observation-type-by-model
metrics were derivable only from the legacy per-occurrence events
(context_injected, session_compressed), which decay to zero as the fleet
upgrades to 13.7.0 and switches to the rollups. The rollups already received
the underlying records — they just didn't aggregate the observation fields.
- observer_turn_rollup: add observations_created (Σ per-turn observation count,
distinct from the rollup's turn `count`) + summed obs_type_* buckets, so
cost-per-observation (total_cost_usd / observations_created) and
observation-type-by-top_model are derivable from the rollup alone.
- context_injected_rollup: add total_observations_injected (cache-reuse count)
+ total_tokens_saved_vs_naive (windowed savings sum).
- scrub.ts: whitelist the three new emitted keys (obs_type_* already allowed;
deny-by-default whitelist would drop them otherwise).
- docs: correct the rollup field tables — the prior context_injected_rollup row
documented fields the code never actually emitted.
- tests: assert both new aggregations (167 telemetry tests pass).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LEZpnYz9z4TjKcG19qHFrJ
* build(telemetry): regenerate plugin bundles for rollup observation fields
worker-service.cjs and transcript-watcher.cjs rebuilt via `npm run build` to
bundle the new observation aggregation. Incidental, telemetry-unrelated churn
in the other service/UI bundles was left out to keep the diff meaningful.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LEZpnYz9z4TjKcG19qHFrJ
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
