feat: enhancement workflow preset system with multi-target CLI

- Add YAML-based enhancement workflow presets shipped inside the package
  (default, minimal, security-focus, architecture-comprehensive, api-documentation)
- Add `skill-seekers workflows` subcommand: list, show, copy, add, remove, validate
- copy/add/remove all accept multiple names/files in one invocation with partial-failure behaviour
- `add --name` override restricted to single-file operations
- Add 5 MCP tools: list_workflows, get_workflow, create_workflow, update_workflow, delete_workflow
- Fix: create command _add_common_args() now correctly forwards each --enhance-workflow
  as a separate flag instead of passing the whole list as a single argument
- Update README: reposition as "data layer for AI systems" with AI Skills front and centre
- Update CHANGELOG, QUICK_REFERENCE, CLAUDE.md with workflow preset details
- 1,880+ tests passing

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

tests/test_cli_parsers.py

@@ -23,19 +23,20 @@ class TestParserRegistry:
     """Test parser registry functionality."""
 
     def test_all_parsers_registered(self):
-        """Test that all 19 parsers are registered."""
-        assert len(PARSERS) == 20, f"Expected 19 parsers, got {len(PARSERS)}"
+        """Test that all parsers are registered."""
+        assert len(PARSERS) == 21, f"Expected 21 parsers, got {len(PARSERS)}"
 
     def test_get_parser_names(self):
         """Test getting list of parser names."""
         names = get_parser_names()
-        assert len(names) == 20
+        assert len(names) == 21
         assert "scrape" in names
         assert "github" in names
         assert "package" in names
         assert "upload" in names
         assert "analyze" in names
         assert "config" in names
+        assert "workflows" in names
 
     def test_all_parsers_are_subcommand_parsers(self):
         """Test that all parsers inherit from SubcommandParser."""
@@ -241,9 +242,9 @@ class TestBackwardCompatibility:
             assert cmd in names, f"Command '{cmd}' not found in parser registry!"
 
     def test_command_count_matches(self):
-        """Test that we have exactly 20 commands (includes new create command)."""
-        assert len(PARSERS) == 20
-        assert len(get_parser_names()) == 20
+        """Test that we have exactly 21 commands (includes new create and workflows commands)."""
+        assert len(PARSERS) == 21
+        assert len(get_parser_names()) == 21
 
 
 if __name__ == "__main__":