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zhuyongxin ac1f831903 feat(rag): chunk evidence identity, dedup, and search port

Preserve same-document multi-chunk evidence with evidenceKey identity,
per-document caps, retrieve-k/return-n split, and a dense KnowledgeSearchPort.
Archives Delivery 1 OpenSpec change as the foundation for hybrid retrieval.

2026-07-27 18:26:15 +08:00

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rag-knowledge-retrieval Delta

MODIFIED Requirements

Requirement: Knowledge retrieval SHALL deduplicate evidence blocks

The retrieval flow SHALL remove duplicate evidence blocks before returning them to the Agent. Duplicates are defined by chunk-level evidenceKey identity, not by document source alone.

Scenario: Chunk-level deduplication keeps distinct chunks

WHEN L1 produces multiple candidates with the same source but different chunk identities
THEN the retrieval flow SHALL keep separate evidence blocks for those chunk identities subject to per-document caps
AND SHALL NOT collapse them solely because source is equal

Scenario: Same evidenceKey collapses

WHEN two candidates share the same evidenceKey
THEN the retrieval flow SHALL keep a single evidence block for that identity
AND the evidence block SHALL preserve hit reasons from both paths when available

Scenario: Postprocess count tracking

WHEN evidence post-processing completes
THEN the tool invocation details SHALL record candidate count and final evidence block count

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