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>

agent/src/input/mouse.rs

@@ -19,8 +19,7 @@ const XBUTTON2: u32 = 0x0002;
 
 #[cfg(windows)]
 use windows::Win32::UI::WindowsAndMessaging::{
-    GetSystemMetrics, SM_CXVIRTUALSCREEN, SM_CYVIRTUALSCREEN, SM_XVIRTUALSCREEN,
-    SM_YVIRTUALSCREEN,
+    GetSystemMetrics, SM_CXVIRTUALSCREEN, SM_CYVIRTUALSCREEN, SM_XVIRTUALSCREEN, SM_YVIRTUALSCREEN,
 };
 
 /// Mouse input controller
@@ -190,9 +189,7 @@ impl MouseController {
     /// Send input events
     #[cfg(windows)]
     fn send_input(&self, inputs: &[INPUT]) -> Result<()> {
-        let sent = unsafe {
-            SendInput(inputs, std::mem::size_of::<INPUT>() as i32)
-        };
+        let sent = unsafe { SendInput(inputs, std::mem::size_of::<INPUT>() as i32) };
 
         if sent as usize != inputs.len() {
             anyhow::bail!("SendInput failed: sent {} of {} inputs", sent, inputs.len());