fix(fuse): keep a rename made as its create lands (B152); wake an op once the name it waits for is free (B153)

Adoption asks again under the tree lock whether a rename is queued, and
writes the node row through the lock's outbox, so a rename made while
the create landed is no longer undone in the tree and the row.

An op that finds its name held fails as NameHeld: it backs off by the
minimum without doubling, and wakes the waiters for its name again once
its failure is recorded, so a trash that landed in between is not missed.

crates/pdfs-fuse/src/state.rs

@@ -884,6 +884,11 @@ impl State {
         }
     }
 
+    /// Write `node` through as it is, in order with the tree's other changes.
+    pub(crate) fn write_through(&mut self, node: Node) {
+        self.outbox.push(DbWrite::Upsert(vec![node]));
+    }
+
     pub(crate) fn intern(&mut self, parent: u64, mut node: Node) -> u64 {
         self.keep_revision_mtime(&mut node);
         self.outbox.push(DbWrite::Upsert(vec![node.clone()]));