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/auth/token_blacklist.rs

@@ -6,7 +6,7 @@
 use std::collections::HashSet;
 use std::sync::Arc;
 use tokio::sync::RwLock;
-use tracing::{info, debug};
+use tracing::{debug, info};
 
 /// Token blacklist for revocation
 ///
@@ -41,7 +41,10 @@ impl TokenBlacklist {
         let was_new = tokens.insert(token.to_string());
 
         if was_new {
-            debug!("Token revoked and added to blacklist (length: {})", token.len());
+            debug!(
+                "Token revoked and added to blacklist (length: {})",
+                token.len()
+            );
         }
     }
 
@@ -92,7 +95,11 @@ impl TokenBlacklist {
         let removed = original_len - tokens.len();
 
         if removed > 0 {
-            info!("Cleaned {} expired tokens from blacklist ({} remaining)", removed, tokens.len());
+            info!(
+                "Cleaned {} expired tokens from blacklist ({} remaining)",
+                removed,
+                tokens.len()
+            );
         }
 
         removed