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Architecture note steps 1, 2, 10 (data model). - types/transactionState.ts: 12 states, allowed-transition table, SoD matrix - types/plan.ts: add InstrumentTerms + 'issueInstrument' PlanStep type - services/planValidation.ts: validate SBLC step (BIC, ISO-4217, sha256, YYYY-MM-DD expiry, >0 amount) - services/stateMachine.ts: transition() enforces legality + SoD + appends to transaction_state_transitions - db/migrations/002: plans.transaction_state (CHECK) + transaction_state_transitions append-only table - tests/unit: 13 + 8 unit tests (31 total, all pass) No behaviour change yet: coordinator still uses legacy status field. PRs B-G will migrate execution paths onto the new machine.