fix(ignore): add uv/pdm/bun/deno/flake locks to default ignores

Every other lock file (package-lock, yarn, pnpm, poetry, Cargo, ...) was
already default-ignored, but uv.lock and other modern lockfiles leaked into
output — only spared from bloat when they happened to exceed max-file-bytes.

Claude-Session: https://claude.ai/code/session_0186xqSd1qXF2FbRfprfuAjN

Author: nikolay-e

src/diffctx/ignore.py

@@ -269,11 +269,17 @@ def _collect_parent_ignore_patterns(root: Path, ignore_filenames: list[str]) ->
     "**/package-lock.json",
     "**/yarn.lock",
     "**/pnpm-lock.yaml",
+    "**/bun.lock",
+    "**/bun.lockb",
+    "**/deno.lock",
     "**/Pipfile.lock",
     "**/poetry.lock",
+    "**/uv.lock",
+    "**/pdm.lock",
     "**/Cargo.lock",
     "**/composer.lock",
     "**/Gemfile.lock",
+    "**/flake.lock",
     # Java/JVM
     "**/target/",
     "**/.gradle/",

tests/test_default_ignores.py

@@ -107,6 +107,41 @@ def test_default_private_key_ignores(temp_project, run_mapper):
         assert f in all_files, f
 
 
+def test_default_lockfile_ignores(temp_project, run_mapper):
+    lockfiles = [
+        "package-lock.json",
+        "yarn.lock",
+        "pnpm-lock.yaml",
+        "bun.lock",
+        "bun.lockb",
+        "deno.lock",
+        "Pipfile.lock",
+        "poetry.lock",
+        "uv.lock",
+        "pdm.lock",
+        "Cargo.lock",
+        "composer.lock",
+        "Gemfile.lock",
+        "flake.lock",
+    ]
+    for lockfile in lockfiles:
+        (temp_project / lockfile).write_text("generated lock content\n", encoding="utf-8")
+
+    kept = ["pyproject.toml", "package.json", "Cargo.toml"]
+    for f in kept:
+        (temp_project / f).write_text("real manifest\n", encoding="utf-8")
+
+    assert run_mapper([".", "-o", "directory_tree.yaml"])
+    result = load_yaml(temp_project / "directory_tree.yaml")
+    all_files = get_all_files_in_tree(result)
+
+    for lockfile in lockfiles:
+        assert lockfile not in all_files, lockfile
+
+    for f in kept:
+        assert f in all_files, f
+
+
 def test_default_directory_ignores(temp_project, run_mapper):
     for dir_name in ["node_modules", "venv", ".venv"]:
         d = temp_project / dir_name