feat(path): rename-aware ambiguity resolution for suffix probe

When a bare filename like 'operators.ts' matches multiple full paths,
check if they are the same file connected by renames (via BFS on
mr_file_changes). If so, auto-resolve to the newest path instead of
erroring. Also wires path resolution into file-history and trace
commands so bare filenames work everywhere.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/core/path_resolver_tests.rs

@@ -288,3 +288,80 @@ fn test_exact_match_preferred_over_suffix() {
     assert_eq!(pq.value, "README.md");
     assert!(!pq.is_prefix);
 }
+
+fn seed_rename(conn: &Connection, mr_id: i64, project_id: i64, old_path: &str, new_path: &str) {
+    conn.execute(
+        "INSERT INTO mr_file_changes (merge_request_id, project_id, old_path, new_path, change_type)
+         VALUES (?1, ?2, ?3, ?4, 'renamed')",
+        rusqlite::params![mr_id, project_id, old_path, new_path],
+    )
+    .unwrap();
+}
+
+// ─── rename-aware ambiguity resolution ──────────────────────────────────────
+
+#[test]
+fn test_ambiguity_resolved_by_rename_chain() {
+    let conn = setup_test_db();
+    seed_project(&conn, 1);
+    seed_mr(&conn, 1, 1);
+    seed_mr(&conn, 2, 1);
+
+    // File was at src/old/operators.ts, then renamed to src/new/operators.ts
+    seed_file_change(&conn, 1, 1, "src/old/operators.ts");
+    seed_rename(&conn, 2, 1, "src/old/operators.ts", "src/new/operators.ts");
+
+    // Bare "operators.ts" matches both paths via suffix probe, but they're
+    // connected by a rename — should auto-resolve to the newest path.
+    let pq = build_path_query(&conn, "operators.ts", Some(1)).unwrap();
+    assert_eq!(pq.value, "src/new/operators.ts");
+    assert!(!pq.is_prefix);
+}
+
+#[test]
+fn test_ambiguity_not_resolved_when_genuinely_different_files() {
+    let conn = setup_test_db();
+    seed_project(&conn, 1);
+    seed_mr(&conn, 1, 1);
+
+    // Two genuinely different files with the same name (no rename connecting them)
+    seed_file_change(&conn, 1, 1, "src/utils/helpers.ts");
+    seed_file_change(&conn, 1, 1, "tests/utils/helpers.ts");
+
+    let err = build_path_query(&conn, "helpers.ts", Some(1)).unwrap_err();
+    assert!(err.to_string().contains("matches multiple paths"));
+}
+
+#[test]
+fn test_ambiguity_rename_chain_with_three_hops() {
+    let conn = setup_test_db();
+    seed_project(&conn, 1);
+    seed_mr(&conn, 1, 1);
+    seed_mr(&conn, 2, 1);
+    seed_mr(&conn, 3, 1);
+
+    // File named "config.ts" moved twice: lib/ -> src/ -> src/core/
+    seed_file_change(&conn, 1, 1, "lib/config.ts");
+    seed_rename(&conn, 2, 1, "lib/config.ts", "src/config.ts");
+    seed_rename(&conn, 3, 1, "src/config.ts", "src/core/config.ts");
+
+    // "config.ts" matches lib/config.ts, src/config.ts, src/core/config.ts via suffix
+    let pq = build_path_query(&conn, "config.ts", Some(1)).unwrap();
+    assert_eq!(pq.value, "src/core/config.ts");
+    assert!(!pq.is_prefix);
+}
+
+#[test]
+fn test_ambiguity_rename_without_project_id_stays_ambiguous() {
+    let conn = setup_test_db();
+    seed_project(&conn, 1);
+    seed_mr(&conn, 1, 1);
+    seed_mr(&conn, 2, 1);
+
+    seed_file_change(&conn, 1, 1, "src/old/utils.ts");
+    seed_rename(&conn, 2, 1, "src/old/utils.ts", "src/new/utils.ts");
+
+    // Without project_id, rename resolution is skipped → stays ambiguous
+    let err = build_path_query(&conn, "utils.ts", None).unwrap_err();
+    assert!(err.to_string().contains("matches multiple paths"));
+}