style: cargo fmt --all — make codebase rustfmt-clean

First run of the build-and-test CI gate (cargo fmt --all -- --check) surfaced
pre-existing formatting drift across the agent and server crates. Apply rustfmt
across the workspace so the codebase meets its own CI gate. Pure formatting; no
logic changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/src/db/mod.rs

@@ -3,24 +3,24 @@
 //! Handles persistence for machines, sessions, and audit logging.
 //! Optional - server works without database if DATABASE_URL not set.
 
-pub mod machines;
-pub mod sessions;
 pub mod events;
+pub mod machines;
+pub mod releases;
+pub mod sessions;
 pub mod support_codes;
 pub mod users;
-pub mod releases;
 
 use anyhow::Result;
 use sqlx::postgres::PgPoolOptions;
 use sqlx::PgPool;
 use tracing::info;
 
-pub use machines::*;
-pub use sessions::*;
 pub use events::*;
+pub use machines::*;
+pub use releases::*;
+pub use sessions::*;
 pub use support_codes::*;
 pub use users::*;
-pub use releases::*;
 
 /// Database connection pool wrapper
 #[derive(Clone)]