Problem
The same person or organization appears in multiple investigation KBs. "Vladimir Putin" in the kleptocracy timeline is the same entity as "Vladimir Putin" in a separate oligarch investigation KB. Currently there's no way to detect this or link the entries across KBs.
Scope
Cross-KB entity matching using the alias fuzzy matching pipeline (reuse from actor-alias-suggestion tool)
Match by: title, aliases, key identifiers (jurisdiction, org_type)
Create cross-KB links: `same_as` relationship type linking entries across KBs
CLI: `pyrite investigation find-duplicates --across-kbs`
MCP tool: `investigation_find_duplicates` — scan for cross-KB matches
Review mode: show matches with confidence scores, accept/reject
Accepted matches create `same_as` links visible in entity profile viewsAcceptance Criteria
Cross-KB matching detects same entities across 2+ KBs
Fuzzy matching reuses the 6-pass alias detection pipeline
`same_as` links traversable in both directions
Entity profile view shows cross-KB appearances
No data modification in source KBs — links are additive only