style: clear clippy warnings from the stealth/adaptive work

- snapshot: make collect_fingerprints private (TreeNode is private, so a
  pub(super) fn leaked a more-private type)
- adaptive: if-let instead of single-arm match in attr_score
- stealth: move timezone test module to end of file (items-after-test-module)

No behavior change. Pre-release cleanup.

cli/src/native/adaptive.rs

@@ -152,15 +152,13 @@ fn attr_score(base: &BTreeMap<String, String>, cand: &BTreeMap<String, String>)
     for name in names {
         let w = attr_weight(name);
         total += w;
-        match (base.get(name), cand.get(name)) {
-            (Some(a), Some(b)) => {
-                if name == "class" {
-                    got += w * token_jaccard(a, b);
-                } else if a == b {
-                    got += w;
-                }
+        // present on only one side → no credit
+        if let (Some(a), Some(b)) = (base.get(name), cand.get(name)) {
+            if name == "class" {
+                got += w * token_jaccard(a, b);
+            } else if a == b {
+                got += w;
             }
-            _ => {} // present on only one side → no credit
         }
     }
     if total == 0.0 {

cli/src/native/snapshot.rs

@@ -226,7 +226,7 @@ fn build_ax_fingerprint(tree_nodes: &[TreeNode], idx: usize) -> ElementFingerpri
 /// Collect AX fingerprints for every node that has a backend node id, used as the
 /// candidate set when relocating a stale @ref. Reuses the same extraction as the
 /// baseline so the two are scored in the same space.
-pub(super) fn collect_fingerprints(tree_nodes: &[TreeNode]) -> Vec<(i64, ElementFingerprint)> {
+fn collect_fingerprints(tree_nodes: &[TreeNode]) -> Vec<(i64, ElementFingerprint)> {
     tree_nodes
         .iter()
         .enumerate()

cli/src/native/stealth.rs

@@ -196,46 +196,6 @@ fn resolve_timezone(locale: Option<&str>) -> Option<String> {
 /// Best-effort IANA timezone for a locale. Used only for
 /// `AGENT_BROWSER_TIMEZONE=auto`; unknown locales return `None` so the real
 /// timezone is left untouched rather than guessing a wrong one.
-#[cfg(test)]
-mod timezone_tests {
-    use super::{locale_default_timezone, resolve_timezone};
-
-    #[test]
-    fn maps_common_locales_case_insensitively() {
-        assert_eq!(locale_default_timezone("en-US"), Some("America/New_York"));
-        assert_eq!(locale_default_timezone("ja-JP"), Some("Asia/Tokyo"));
-        assert_eq!(locale_default_timezone("zh-CN"), Some("Asia/Shanghai"));
-        assert_eq!(locale_default_timezone("ZH-TW"), Some("Asia/Taipei"));
-        assert_eq!(locale_default_timezone("ja"), Some("Asia/Tokyo"));
-    }
-
-    #[test]
-    fn unknown_locale_returns_none() {
-        assert_eq!(locale_default_timezone("xx-YY"), None);
-        assert_eq!(locale_default_timezone(""), None);
-    }
-
-    #[test]
-    fn resolve_timezone_honors_env() {
-        // Serialized via a single test to avoid cross-test env races on this key.
-        std::env::remove_var("AGENT_BROWSER_TIMEZONE");
-        assert_eq!(resolve_timezone(Some("en-US")), None);
-
-        std::env::set_var("AGENT_BROWSER_TIMEZONE", "Europe/Berlin");
-        assert_eq!(resolve_timezone(None), Some("Europe/Berlin".to_string()));
-
-        std::env::set_var("AGENT_BROWSER_TIMEZONE", "  ");
-        assert_eq!(resolve_timezone(Some("en-US")), None);
-
-        std::env::set_var("AGENT_BROWSER_TIMEZONE", "auto");
-        assert_eq!(resolve_timezone(Some("ja-JP")), Some("Asia/Tokyo".to_string()));
-        assert_eq!(resolve_timezone(Some("xx-YY")), None);
-        assert_eq!(resolve_timezone(None), None);
-
-        std::env::remove_var("AGENT_BROWSER_TIMEZONE");
-    }
-}
-
 fn locale_default_timezone(locale: &str) -> Option<&'static str> {
     let tz = match locale.to_ascii_lowercase().as_str() {
         "en-us" => "America/New_York",
@@ -372,3 +332,43 @@ fn build_ua_metadata(ua: &str, locale: Option<&str>) -> serde_json::Value {
         "wow64": false,
     })
 }
+
+#[cfg(test)]
+mod timezone_tests {
+    use super::{locale_default_timezone, resolve_timezone};
+
+    #[test]
+    fn maps_common_locales_case_insensitively() {
+        assert_eq!(locale_default_timezone("en-US"), Some("America/New_York"));
+        assert_eq!(locale_default_timezone("ja-JP"), Some("Asia/Tokyo"));
+        assert_eq!(locale_default_timezone("zh-CN"), Some("Asia/Shanghai"));
+        assert_eq!(locale_default_timezone("ZH-TW"), Some("Asia/Taipei"));
+        assert_eq!(locale_default_timezone("ja"), Some("Asia/Tokyo"));
+    }
+
+    #[test]
+    fn unknown_locale_returns_none() {
+        assert_eq!(locale_default_timezone("xx-YY"), None);
+        assert_eq!(locale_default_timezone(""), None);
+    }
+
+    #[test]
+    fn resolve_timezone_honors_env() {
+        // Serialized via a single test to avoid cross-test env races on this key.
+        std::env::remove_var("AGENT_BROWSER_TIMEZONE");
+        assert_eq!(resolve_timezone(Some("en-US")), None);
+
+        std::env::set_var("AGENT_BROWSER_TIMEZONE", "Europe/Berlin");
+        assert_eq!(resolve_timezone(None), Some("Europe/Berlin".to_string()));
+
+        std::env::set_var("AGENT_BROWSER_TIMEZONE", "  ");
+        assert_eq!(resolve_timezone(Some("en-US")), None);
+
+        std::env::set_var("AGENT_BROWSER_TIMEZONE", "auto");
+        assert_eq!(resolve_timezone(Some("ja-JP")), Some("Asia/Tokyo".to_string()));
+        assert_eq!(resolve_timezone(Some("xx-YY")), None);
+        assert_eq!(resolve_timezone(None), None);
+
+        std::env::remove_var("AGENT_BROWSER_TIMEZONE");
+    }
+}