fix: Update tests to match schema reference metadata feature

Fix failing tests that expected content to start with heading but now
include schema reference comments. Also fix validate command syntax
in test (positional to --schema flag).

Fixes:
- test_generate_stub_with_explicit_associated_path
- test_generate_stub_interactive_mode_defaults_to_associated_path
- test_generate_stub_validates_generated_draft_against_schema

These tests were failing due to changes from Issue #55 schema reference
metadata feature and validate command syntax updates.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

tests/test_issue_40_cli_integration.py

@@ -96,9 +96,11 @@ class TestIssue40CLIIntegration:
         # Should create associated markdown file
         assert expected_md.exists()
 
-        # Verify it's valid markdown
+        # Verify it's valid markdown with schema reference
         md_content = expected_md.read_text()
-        assert md_content.startswith('# ')
+        # Content should include schema reference metadata and heading
+        assert '<!-- Generated from schema:' in md_content
+        assert '# Template Schema' in md_content
 
     def test_generate_stub_interactive_mode_defaults_to_associated_path(self, runner, temp_dir):
         """generate-stub in interactive mode should default to associated path."""
@@ -129,9 +131,11 @@ class TestIssue40CLIIntegration:
         expected_md = temp_dir / "template.md"
         assert expected_md.exists()
 
-        # Verify it's valid markdown
+        # Verify it's valid markdown with schema reference
         md_content = expected_md.read_text()
-        assert md_content.startswith('# ')
+        # Content should include schema reference metadata and heading
+        assert '<!-- Generated from schema:' in md_content
+        assert '# Template Schema' in md_content
 
     def test_validate_auto_discovers_associated_schema(self, runner, temp_dir):
         """validate should auto-discover associated schema when not specified."""

tests/test_issue_55_schema_based_draft_generation.py

@@ -382,7 +382,7 @@ class TestIssue55SchemaBasedDraftGeneration:
             validate_result = self.runner.invoke(cli, [
                 'validate',
                 str(draft_file),
-                str(schema_file)
+                '--schema', str(schema_file)
             ])
 
             # Assert - Generated draft should be valid against its source schema