fix(cli): ignore generated folders by default

- Skip .comments, virtualenvs, env files, VCS folders, and OS metadata in sync.
- Apply defaults before project .nanoshareignore and repeatable --ignore rules.
- Cover default ignores for local uploads and direct pattern matching.

tests/test_nanoshare_cli.py

@@ -9,7 +9,7 @@ sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'cli'))
 from nanoshare_client import cli
 from nanoshare_client.auth import _CallbackServer
 from nanoshare_client.completion import script as completion_script
-from nanoshare_client.ignore import is_ignored
+from nanoshare_client.ignore import load_ignore_patterns, is_ignored
 from nanoshare_client.table import format_table
 
 class FakeClient:
@@ -210,6 +210,12 @@ def test_sync_ignores_local_files_from_nanoshareignore(tmp_path, monkeypatch):
   (tmp_path / 'cache').mkdir()
   (tmp_path / 'cache' / 'ignored.txt').write_text('ignored')
   (tmp_path / 'scratch.tmp').write_text('ignored')
+  (tmp_path / '.comments').mkdir()
+  (tmp_path / '.comments' / 'ignored.xml').write_text('<comment />')
+  (tmp_path / '.env').write_text('SECRET=ignored')
+  (tmp_path / '.venv').mkdir()
+  (tmp_path / '.venv' / 'ignored.py').write_text('ignored')
+  (tmp_path / 'Thumbs.db').write_text('ignored')
 
   code = cli.main([
     'sync',
@@ -250,6 +256,18 @@ def test_ignore_patterns_match_files_and_directories():
   assert is_ignored('docs/page.draft.md', patterns)
   assert not is_ignored('docs/page.md', patterns)
 
+def test_default_ignore_patterns_skip_common_generated_files(tmp_path):
+  patterns = load_ignore_patterns(tmp_path)
+
+  assert is_ignored('.comments/comment.xml', patterns)
+  assert is_ignored('.env', patterns)
+  assert is_ignored('.env.local', patterns)
+  assert is_ignored('.venv/bin/python', patterns)
+  assert is_ignored('venv/bin/python', patterns)
+  assert is_ignored('__pycache__/mod.pyc', patterns)
+  assert is_ignored('nested/Thumbs.db', patterns)
+  assert not is_ignored('docs/note.txt', patterns)
+
 def test_completion_scripts_include_commands():
   zsh = completion_script('zsh')
   bash = completion_script('bash')