docs: reconcile current acceptance and retire obsolete status
docs: synchronize intelligence, product and operating contracts
docs: align investigation tool and question method paths
docs: record registered-source investigation capability
Clarify investigation evidence-gap stop outcomes
Document investigation partial-state and task audit correction
Specify public evidence excerpt presentation boundary
docs: reconcile technical designs with formal closure
docs: harden artifact persistence
docs: checkpoint TD2A and TD3 implementation review
docs: update TD2 implementation status
docs: refine TD2 agent runtime contracts
docs: restore technical design 2 runtime detail
docs: number technical design documents