Upgrade ConfigKit to v0.3.0

docs/roadmap/implementation.md

@@ -108,7 +108,23 @@ Acceptance:
 
 ## Stage 2 — Adopt the released dependency and version diagnostics
 
-Status: Not started
+Status: Complete — 2026-09-16
+
+Completion: Upgraded the normal module graph from ConfigKit v0.1.2 to the
+released v0.3.0 without production-code migration. Party schema version `1`
+remains invalid through Narratio's unsupported-version check, while a boolean
+case preserves malformed-kind coverage. Existing credential, ownership,
+inspection, provenance, digest, bootstrap, and maintained-example regressions
+pass unchanged.
+
+Checks:
+
+- `GOWORK=off go mod tidy -diff` — pass.
+- `GOWORK=off go mod verify` — pass.
+- `GOWORK=off go test ./internal/config ./internal/app` — pass.
+- `GOWORK=off go test -race ./internal/config ./internal/app` — pass.
+- Targeted preserved-behavior regression selections in `internal/config` and
+  `internal/app` — pass.
 
 Purpose: Upgrade without altering the set of valid Narratio configurations.