test(store): the tree helper skips the live SQLite files (P11c)

spec_store's tree() read every file under the root while a Store was
open; on Windows SQLite holds byte-range locks on its database, so the
read failed (os error 33) in two tests. The lock seam locks only
wanderbooks.lock, never data, so it is not the cause. tree() now leaves
out the live database and its -wal/-shm/-journal; the tests compare the
journal, blobs and kept-aside files.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

crates/ledger-store/tests/spec_store.rs

@@ -125,13 +125,28 @@ fn line_types(dir: &Path) -> Vec<String> {
         .collect()
 }
 
-/// Every file under `dir` (relative path → bytes).
+/// Whether `p` is the live SQLite database or one of its companions.
+fn is_live_database(p: &Path) -> bool {
+    let name = p.file_name().unwrap().to_string_lossy().into_owned();
+    let db = db_file();
+    name == db
+        || ["-wal", "-shm", "-journal"]
+            .iter()
+            .any(|x| name == format!("{db}{x}"))
+}
+
+/// Every file under `dir` (relative path → bytes), the live database and
+/// its companions left out.
 fn tree(dir: &Path) -> BTreeMap<PathBuf, Vec<u8>> {
     fn walk(root: &Path, d: &Path, out: &mut BTreeMap<PathBuf, Vec<u8>>) {
         for e in std::fs::read_dir(d).unwrap() {
             let p = e.unwrap().path();
             if p.is_dir() {
                 walk(root, &p, out);
+            } else if p.parent() == Some(root) && is_live_database(&p) {
+                // An open SQLite connection holds byte-range locks on its
+                // database file on Windows: a plain read is refused. The
+                // tests compare the journal, blobs and kept-aside files.
             } else {
                 out.insert(
                     p.strip_prefix(root).unwrap().to_path_buf(),