Installation automation - License key approach

cygnus-installer/README.md

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+# Cygnus installation wizard
+
+The wizard validates Docker, activates a client license, generates a unique
+3072-bit installation signing key, registers the installation, and writes the
+deployment files. The license key is never persisted.
+
+```bash
+java -jar target/cygnus-installer-1.0.0-SNAPSHOT.jar
+```
+
+Set `CYGNUS_CLOUD_URL` before execution. The wizard asks where deployment
+files should be written and offers `CYGNUS_INSTALL_OUTPUT` as the default.
+
+The selected output directory contains:
+
+```text
+compose.yml
+config/
+  installation.yml
+  keys/
+    client-signing-private.pem
+    client-signing-public.pem
+```
+
+The private key is created with owner-only permissions on POSIX systems. The
+plaintext installation license key is never written to the output directory.