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/clawhdf5-onion/src/merkle.rs

@@ -97,7 +97,11 @@ impl RevisionMerkleTree {
     /// The slice **must** be sorted by `revision` in ascending order.
     pub fn build(entries: &[(u64, [u8; 32])]) -> Self {
         let leaf_count = entries.len();
-        let capacity = if leaf_count == 0 { 1 } else { leaf_count.next_power_of_two() };
+        let capacity = if leaf_count == 0 {
+            1
+        } else {
+            leaf_count.next_power_of_two()
+        };
 
         // 1-indexed BFS array; index 0 unused.
         let mut hashes = vec![[0u8; 32]; 2 * capacity + 1];
@@ -113,7 +117,12 @@ impl RevisionMerkleTree {
         // Build internal nodes bottom-up
         build_internal(&mut hashes, capacity);
 
-        RevisionMerkleTree { hashes, leaf_revisions, leaf_count, capacity }
+        RevisionMerkleTree {
+            hashes,
+            leaf_revisions,
+            leaf_count,
+            capacity,
+        }
     }
 
     // ── Queries ───────────────────────────────────────────────────────────────
@@ -311,7 +320,7 @@ impl RevisionMerkleTree {
 /// `hashes` must have length `2 * capacity + 1`.
 fn build_internal(hashes: &mut [[u8; 32]], capacity: usize) {
     for i in (1..capacity).rev() {
-        let left  = hashes[2 * i];
+        let left = hashes[2 * i];
         let right = hashes[2 * i + 1];
         hashes[i] = node_hash(&left, &right);
     }
@@ -484,7 +493,10 @@ mod tests {
         let header_only = &full[..13]; // 5 + 8 bytes
         assert_eq!(
             RevisionMerkleTree::deserialise(header_only),
-            Err(MerkleError::TruncatedPayload { expected: 5 + 8 + 5 * 40, got: 13 })
+            Err(MerkleError::TruncatedPayload {
+                expected: 5 + 8 + 5 * 40,
+                got: 13
+            })
         );
     }