fix: harden stage10 knowledge retrieval boundaries - #49

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xjx-star:codex/stage10-rag-observability

Commits on Sep 14, 2026

feat: add assignment knowledge evidence baseline
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dfc5a64
fix: expose explicit no-result fallback metric
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b4ce906
fix: degrade safely when knowledge source fails
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6d6a451
fix: distinguish knowledge fallback metrics in logs
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93ab2f1
docs: refresh stage10 verification baseline
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1cc54d2
fix: normalize knowledge receipt rendering
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eac16dd
test: cover stage10 retrieval boundaries
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08dae27