Apply rustfmt to entire workspace

Runs cargo fmt --all; all 573 tests still passing, clippy still clean.
No logic changes — formatting only.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

crates/clawsync-onion/src/selector.rs

@@ -63,10 +63,7 @@ pub fn filter_packets(
 /// Compute the remote HEAD for a given selector on the local `OnionFile`.
 ///
 /// Returns [`NO_PARENT`] if no revisions match (full sync needed).
-pub fn remote_head_for_selector(
-    _selector: &SyncSelector,
-    remote_revision_count: u64,
-) -> u64 {
+pub fn remote_head_for_selector(_selector: &SyncSelector, remote_revision_count: u64) -> u64 {
     // For a simple linear sync, remote HEAD = remote_revision_count - 1
     // (or NO_PARENT if empty).
     if remote_revision_count == 0 {
@@ -131,8 +128,11 @@ mod tests {
     fn selector_branch_nonexistent_errors() {
         let onion = make_onion(2);
         let packets = diff_revisions(&onion, NO_PARENT).unwrap();
-        let result =
-            filter_packets(packets, &SyncSelector::Branch("no-such".to_string()), &onion);
+        let result = filter_packets(
+            packets,
+            &SyncSelector::Branch("no-such".to_string()),
+            &onion,
+        );
         assert!(matches!(result, Err(SyncOnionError::BranchNotFound(_))));
     }