How

Every engagement progresses through a defined state machine. State transitions are forward-only by design — the system does not permit retroactive modification of completed states. Each transition is gated by preconditions that must be satisfied before the system permits advancement.

The lifecycle follows a non-decreasing phase sequence: authority establishment, intake and preprocessing, constraint evaluation, record freezing, sealing, closure certification, export, and archive. Each phase enforces its own preconditions. A phase cannot be entered until all preceding phases have been satisfied. A phase, once completed, cannot be re-entered or modified.

The system evaluates constraints deterministically. Given the same inputs and state, the system produces the same outcome. There is no probabilistic evaluation, no human-in-the-loop override for constraint checks, and no discretionary bypass mechanism.

When a constraint is not satisfied, the system returns a specific error code identifying the failed precondition. The system does not suggest workarounds, alternative paths, or approximate solutions. Constraint failure is terminal for the attempted operation.

Every state transition, authorization check, constraint evaluation, and material operation is recorded as an immutable governance event. Events capture the actor, timestamp, operation type, engagement context, and outcome. Events are append-only — they cannot be modified or deleted after creation.

The audit trail is designed to support after-the-fact reconstruction of the complete procedural history of an engagement. Any party with appropriate authorization can trace the sequence of operations, the actors involved, and the constraint evaluations that governed each transition.

At defined points in the lifecycle, the system produces sealed records — cryptographically hashed snapshots of engagement state that are designed to be tamper-evident. Sealed records include the data, the hash, and the attestation of the sealing actor. Once sealed, a record cannot be modified without invalidating its hash.

Sealing is a one-way operation. The system does not support unsealing, amendment, or correction of sealed records. If the underlying data requires correction, a new record must be produced through the standard lifecycle, and the original sealed record remains in the audit trail as a historical artifact.

Procedural closure is the system-enforced progression of an engagement from inception through defined phases to a terminal, sealed state. Closure is not a discretionary decision — it is a procedural determination that all required steps have been completed and all constraints satisfied. The terminal state is irreversible.

The closure sequence is defined by the engagement posture and configuration. Upon satisfaction of all closure preconditions, the system produces a closure certificate attesting to the procedural history and terminal state of the engagement. No further state mutations are permitted after closure.