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The community and enterprise bootstrap scripts now generate a dedicated `server.auth.sessionCookieEncryptionKey` from 32 random bytes for fresh installations. The key is Base64-encoded, persisted independently from the datastore encryption key, and reused from the generated configuration after restarts. The community script now also creates `config.yaml` with mode `0600` before writing it, matching the existing enterprise behavior. The server already supports the session cookie encryption key, but the bootstrap scripts left it unset. This adds defense-in-depth for newly generated deployments while preserving the existing server-side nonce validation. Because this only changes newly generated configuration, existing installations and sessions are unchanged. A focused regression test checks key presence, decoded length, separation from the datastore key, YAML placement, and file mode for both scripts. It is included in the infrastructure workflow.