Why:
Higher-ranked private rows could exhaust SQL candidate limits and hide an
otherwise authorized published slice from a member's current-project search.
Evidence:
SELF TestAuthorizedKnowledgeFiltersBeforeTopK failed with no shared hits before
the change and passed after it. SELF go test ./... and the isolated PostgreSQL
Store suite passed; independent replay and current-HEAD CI remain owner gates.
Impact:
Scan the resource-authorized shared fulltext path until enough allowed results
are found. Preserve ordinary legacy retrieval candidate limits and semantics.
Refs:
Dev project-member-access plan r1 Task 1; R5 published knowledge availability
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