refactor: remove common-cache action

Delete common-cache action and all associated test files. All actions
now use native actions/cache@v4.3.0 instead of the wrapper.

Deleted:
- common-cache/action.yml
- common-cache/README.md
- common-cache/rules.yml
- common-cache/CustomValidator.py
- _tests/unit/common-cache/validation.spec.sh
- _tests/integration/workflows/common-cache-test.yml
- validate-inputs/tests/test_common-cache_custom.py

Action count: 28 → 27

validate-inputs/tests/test_common-cache_custom.py

@@ -1,74 +0,0 @@
-"""Tests for common-cache custom validator.
-
-Generated by generate-tests.py - Do not edit manually.
-"""
-# pylint: disable=invalid-name  # Test file name matches action name
-
-import sys
-from pathlib import Path
-
-# Add action directory to path to import custom validator
-action_path = Path(__file__).parent.parent.parent / "common-cache"
-sys.path.insert(0, str(action_path))
-
-# pylint: disable=wrong-import-position
-from CustomValidator import CustomValidator
-
-
-class TestCustomCommonCacheValidator:
-    """Test cases for common-cache custom validator."""
-
-    def setup_method(self):
-        """Set up test fixtures."""
-        self.validator = CustomValidator("common-cache")
-
-    def teardown_method(self):
-        """Clean up after tests."""
-        self.validator.clear_errors()
-
-    def test_validate_inputs_valid(self):
-        """Test validation with valid inputs."""
-        # TODO: Add specific valid inputs for common-cache
-        inputs = {}
-        result = self.validator.validate_inputs(inputs)
-        # Adjust assertion based on required inputs
-        assert isinstance(result, bool)
-
-    def test_validate_inputs_invalid(self):
-        """Test validation with invalid inputs."""
-        # TODO: Add specific invalid inputs for common-cache
-        inputs = {"invalid_key": "invalid_value"}
-        result = self.validator.validate_inputs(inputs)
-        # Custom validators may have specific validation rules
-        assert isinstance(result, bool)
-
-    def test_required_inputs(self):
-        """Test required inputs detection."""
-        required = self.validator.get_required_inputs()
-        assert isinstance(required, list)
-        # TODO: Assert specific required inputs for common-cache
-
-    def test_validation_rules(self):
-        """Test validation rules."""
-        rules = self.validator.get_validation_rules()
-        assert isinstance(rules, dict)
-        # TODO: Assert specific validation rules for common-cache
-
-    def test_github_expressions(self):
-        """Test GitHub expression handling."""
-        inputs = {
-            "test_input": "${{ github.token }}",
-        }
-        result = self.validator.validate_inputs(inputs)
-        assert isinstance(result, bool)
-        # GitHub expressions should generally be accepted
-
-    def test_error_propagation(self):
-        """Test error propagation from sub-validators."""
-        # Custom validators often use sub-validators
-        # Test that errors are properly propagated
-        inputs = {"test": "value"}
-        self.validator.validate_inputs(inputs)
-        # Check error handling
-        if self.validator.has_errors():
-            assert len(self.validator.errors) > 0