fix: run Docker container as non-root user (closes #34)

- Switch to gcr.io/distroless/cc-debian12:nonroot
- Add explicit USER 65534:65534 directive
- Add Docker security CI job verifying non-root UID, :nonroot base, and USER directive
- Document CIS Docker Benchmark compliance in SECURITY.md
- Add tests and edge cases for container security

src/config/mod.rs

@@ -2,7 +2,7 @@ pub mod schema;
 
 pub use schema::{
     AutonomyConfig, BrowserConfig, ChannelsConfig, ComposioConfig, Config, DiscordConfig,
-    GatewayConfig, HeartbeatConfig, IMessageConfig, MatrixConfig, MemoryConfig,
+    GatewayConfig, HeartbeatConfig, IMessageConfig, IdentityConfig, MatrixConfig, MemoryConfig,
     ObservabilityConfig, ReliabilityConfig, RuntimeConfig, SecretsConfig, SlackConfig,
     TelegramConfig, TunnelConfig, WebhookConfig,
 };