diff --git a/core/Cargo.toml b/core/Cargo.toml
index 6d801c0..0f7b842 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -78,6 +78,7 @@ expect_used = "deny"
 too_many_lines = "deny"
 unwrap_used = "deny"
 wildcard_imports = "deny"
+single_match_else = "deny"
 
 [dependencies]
 cel-interpreter = "0.10"
diff --git a/core/src/bin/main.rs b/core/src/bin/main.rs
index d620d78..97f54a2 100644
--- a/core/src/bin/main.rs
+++ b/core/src/bin/main.rs
@@ -152,13 +152,11 @@ fn run_init(dir: &Path) -> io::Result<()> {
 /// session directories accumulate indefinitely. `steplock clean` flushes them all.
 /// The next hook invocation will start each checklist fresh.
 fn run_clean(dir: &Path) -> io::Result<()> {
-    let steplock_dir = match find_repo_root_from(dir) {
-        Some(root) => root.join(".steplock"),
-        None => {
-            println!("steplock: no .steplock/ directory found — nothing to clean");
-            return Ok(());
-        }
+    let Some(root) = find_repo_root_from(dir) else {
+        println!("steplock: no .steplock/ directory found — nothing to clean");
+        return Ok(());
     };
+    let steplock_dir = root.join(".steplock");
     let sessions_dir = steplock_dir.join("sessions");
     if !sessions_dir.exists() {
         println!("steplock: no sessions to clean");