test(signals): cover PDM, Conan, and Pixi lockfile classification cases

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: kiannidev

test/unit/path-matchers.test.ts

@@ -294,6 +294,9 @@ describe("classifyChangedFile", () => {
       ["deno.lock", "lockfile"],
       ["pubspec.lock", "lockfile"],
       ["ios/Podfile.lock", "lockfile"],
+      ["pdm.lock", "lockfile"],
+      ["conan.lock", "lockfile"],
+      ["pixi.lock", "lockfile"],
       ["package.json", "dependency_manifest"],
       ["deno.json", "dependency_manifest"],
       ["apps/web/deno.jsonc", "dependency_manifest"],