feat(signals): classify PDM, Conan, and Pixi lockfiles

Recognize pdm.lock, conan.lock, and pixi.lock so slop path classifiers
weight Python and C++ dependency lock churn separately from source.

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

Author: kiannidev

src/signals/path-matchers.ts

@@ -46,6 +46,9 @@ const LOCKFILE_NAMES: ReadonlySet<string> = new Set([
   "mix.lock",
   "package.resolved",
   "gradle.lockfile",
+  "pdm.lock",
+  "conan.lock",
+  "pixi.lock",
 ]);
 
 const DEPENDENCY_MANIFEST_NAMES: ReadonlySet<string> = new Set([

test/unit/path-matchers.test.ts

@@ -70,6 +70,9 @@ describe("isLockfile", () => {
       "mix.lock",
       "Package.resolved",
       "gradle.lockfile",
+      "pdm.lock",
+      "conan.lock",
+      "pixi.lock",
     ]) {
       expect(isLockfile(path)).toBe(true);
     }