test: Add 5 tests for cli/parsers/sync.py (Module 32)

Coverage boost for sync CLI parsers (31 lines).

Tests added:
- register_parsers function (1 test: adds sync-claude command)
- sync-claude arguments (2 tests: --patterns-dir, --output-dir)
- sync-claude defaults (2 tests: default directories)

All tests passing: 5/5 ✓ (first try!)

Module 32 of coverage enhancement initiative.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: silversurfer562

tests/unit/cli/parsers/test_sync_coverage_boost.py

@@ -0,0 +1,85 @@
+"""Tests for sync CLI parsers.
+
+Module: cli/parsers/sync.py (31 lines)
+"""
+
+import pytest
+from argparse import ArgumentParser
+
+from empathy_os.cli.parsers.sync import register_parsers
+
+
+# ============================================================================
+# register_parsers Tests
+# ============================================================================
+
+
+@pytest.mark.unit
+class TestRegisterParsers:
+    """Test suite for sync parser registration."""
+
+    def test_register_parsers_adds_sync_claude(self):
+        """Test that register_parsers adds sync-claude command."""
+        # Given
+        parser = ArgumentParser()
+        subparsers = parser.add_subparsers()
+
+        # When
+        register_parsers(subparsers)
+
+        # Then
+        # Parse with sync-claude to verify it was registered
+        args = parser.parse_args(["sync-claude"])
+        assert hasattr(args, "func")
+
+    def test_sync_claude_has_patterns_dir_arg(self):
+        """Test that sync-claude has --patterns-dir argument."""
+        # Given
+        parser = ArgumentParser()
+        subparsers = parser.add_subparsers()
+        register_parsers(subparsers)
+
+        # When
+        args = parser.parse_args(["sync-claude", "--patterns-dir", "custom/patterns"])
+
+        # Then
+        assert args.patterns_dir == "custom/patterns"
+
+    def test_sync_claude_has_output_dir_arg(self):
+        """Test that sync-claude has --output-dir argument."""
+        # Given
+        parser = ArgumentParser()
+        subparsers = parser.add_subparsers()
+        register_parsers(subparsers)
+
+        # When
+        args = parser.parse_args(["sync-claude", "--output-dir", "custom/output"])
+
+        # Then
+        assert args.output_dir == "custom/output"
+
+    def test_sync_claude_default_patterns_dir(self):
+        """Test that sync-claude has correct default for patterns-dir."""
+        # Given
+        parser = ArgumentParser()
+        subparsers = parser.add_subparsers()
+        register_parsers(subparsers)
+
+        # When
+        args = parser.parse_args(["sync-claude"])
+
+        # Then
+        assert args.patterns_dir == "patterns"
+
+    def test_sync_claude_default_output_dir(self):
+        """Test that sync-claude has correct default for output-dir."""
+        # Given
+        parser = ArgumentParser()
+        subparsers = parser.add_subparsers()
+        register_parsers(subparsers)
+
+        # When
+        args = parser.parse_args(["sync-claude"])
+
+        # Then
+        assert args.output_dir == ".claude/rules/empathy"