style(email): wrap over-width lines (cargo fmt)

Incidental `cargo fmt --all` normalization of two pre-existing over-width
`.lock()` chains in DevEmailSink; no behavior change.

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

crates/manager-core/src/email_service.rs

@@ -341,7 +341,10 @@ impl DevEmailSink {
     }
 
     fn push(&self, email: CapturedEmail) {
-        let mut q = self.captured.lock().unwrap_or_else(std::sync::PoisonError::into_inner);
+        let mut q = self
+            .captured
+            .lock()
+            .unwrap_or_else(std::sync::PoisonError::into_inner);
         while q.len() >= self.capacity {
             q.pop_front();
         }
@@ -351,7 +354,10 @@ impl DevEmailSink {
     /// Newest-first snapshot of the captured mail.
     #[must_use]
     pub fn snapshot(&self) -> Vec<CapturedEmail> {
-        let q = self.captured.lock().unwrap_or_else(std::sync::PoisonError::into_inner);
+        let q = self
+            .captured
+            .lock()
+            .unwrap_or_else(std::sync::PoisonError::into_inner);
         q.iter().rev().cloned().collect()
     }
 }