feat: seed Lariza feature demonstration

Add synthetic fixtures and proposed policy contracts for safely demonstrating future Lariza capabilities.

Assisted-by: Codex: GPT-5.6

README.md

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+# Protected delivery demo
+
+This repository models a harmless application promotion through development,
+staging, and production. It is a foundation for demonstrating:
+
+- first-class environments and deployment history;
+- independent manual approval and no self-approval;
+- environment-scoped secrets;
+- business-hours and freeze-window decisions;
+- external checks and GitOps reconciliation;
+- audited emergency bypass and release evidence bundles.
+
+The active workflow is manual-only and validates fixtures; it never contacts a
+cluster or changes an environment.