* docs(examples): make Langfuse wrapper degrade cleanly on a real server
The wrapper synthesized child spans (extraction, embedding, hybrid
recall, rerank, index sync, consolidation) from a mock-only `_detail`
field. Against a real EverOS server that field is absent, so those spans
rendered with placeholder data — hardcoded model names, token=0, fixed
sleep durations — and recall scores fell to 0.
Now the per-stage child spans are emitted only when `_detail` is present
(the mock, or future native in-core instrumentation). Against a live
server only the top-level span per operation is emitted, with real
latency and output — no fabricated data. Recall quality
(recall_top_score / recall_hit) is derived from the real search
response, which already carries a per-hit score, so it works against a
live server today, not just the mock.
Verified: mock path unchanged (full trace tree, real scores); real-ish
path (no `_detail`) emits only top-level spans plus a real recall score.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* docs(examples): count empty recalls as a miss in Langfuse hit-rate
When a search returns nothing scored, record recall_hit=0 (span attribute +
Langfuse score) instead of omitting it, so genuine empty recalls still show
up in recall hit-rate. No top_score is emitted (there is no hit to score).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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