feat: implement formal decision registry

docs/DECISIONS_DOMAIN.md

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+# Formal Decisions Domain
+
+## Ownership And Reconstruction
+
+Decisions stores immutable formal-outcome revisions. Each outcome retains the
+responsible human or service actor, represented function/party, effective
+Mandate and jurisdiction, approvals, fact evidence, legal bases, rule versions,
+reasoning, operative result, requested and observed effects, delivery,
+publication, remedy, and review references.
+
+The ordinary read projection withholds protected reasoning and operative
+content. A separate sensitive-read permission is required to disclose it.
+
+## Lifecycle
+
+Writes use the shared Decision transition matrix and optimistic concurrency.
+Correction and revocation create linked revisions; they never edit the previous
+outcome in place. Replaying an identical tenant/decision/revision is idempotent,
+while a different payload under that revision fails.
+
+## Recovery
+
+Database restore is the persistence recovery unit. Requested effects remain
+separate from observed effects and keep audit/evidence references, allowing an
+operator to reconcile an outcome whose external effect was uncertain. Domain
+effect providers retain their own compensation and recovery behavior.