Why: combined filename and Chinese-keyword queries returned no hits even when the uploaded material was present, delaying useful background findings.
Evidence: combined-query, owner/project, duplicate, resource-policy, version-drift and excerpt RED→GREEN tests; SQLite and isolated PostgreSQL pass; Backend full vet and tests pass with the Agent-Native pin.
Impact: only a no-hit material subagent query may read a verified current-task attachment snapshot; general knowledge retrieval remains unchanged.
Refs: U3 r0.4 design; internal/runmgr/material_retrieve.go