Epic 6: Trust-weighted routing and post-investigation feedback

[mdproctor]

DevTownWorkerSelectionStrategy extended for AML: capability-scoped thresholds (osint-screening requires >= 0.70 trust). PostInvestigationFeedback: if SAR is withdrawn or flagged post-submission, write LedgerAttestation(FLAGGED) against the review COMMAND. Trust score decrements automatically. Experienced agents with consistent SAR quality get routed complex cases. Foundation gate: P1.3 TrustWeightedSelectionStrategy wired in engine.