Finalize user-engine contracts and operability

docs/final-assessment.md

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+# Implementation Assessment
+
+## Implemented
+
+- Headless service API for users, accounts, identity links, applications,
+  catalogs, profiles, projections, audit records, and outbox events.
+- Tenant context enforcement, tenant account state, memberships, tenant
+  profile precedence, tenant diagnostics, and cross-tenant denial.
+- Multi-application catalog ownership, namespace collision protection,
+  semantic version checks, sensitivity downgrade prevention, app-filtered
+  projections, and claims-enrichment projection caching.
+- Scenario fixtures and conformance-style tests for positive and negative
+  standalone, tenant, multi-app, redaction, audit, event, and cache paths.
+
+## Boundary Verification
+
+User-engine does not issue tokens, verify MFA, store credentials, act as the
+policy decision point, own deployment, or provide a UI. It consumes verified
+claims through an identity adapter, asks authorization through a port, emits
+audit/outbox records, and exposes backend contracts for future UIs.
+
+## Accepted Deviations
+
+- The first persistence adapter is in-memory. It carries schema and migration
+  semantics but is not durable.
+- The first API surface is in-process Python. HTTP/RPC transport adapters are
+  still future work.
+- Metrics and cache diagnostics are local snapshots, not platform telemetry.
+
+## Follow-Up Work
+
+- Add a durable database adapter and migration tests.
+- Add transport adapters with request/response contract tests.
+- Add platform authorization, audit sink, secret provider, and outbox drain
+  adapters.
+- Add release automation for SBOM, package build, static checks, and
+  deployment handoff.