Make the repository's primary source tree genuinely Python

The old tracked TypeScript snapshot has been removed from the repository history and the root  directory is now a Python porting workspace. README and tests now describe and verify the Python-first layout instead of treating the exposed snapshot as the active source tree.

A local archive can still exist outside Git, but the tracked repository now presents only the Python porting surface, related essay context, and OmX workflow artifacts.

Constraint: Tracked history should collapse to a single commit while excluding the archived snapshot from Git
Rejected: Keep the exposed TypeScript tree in tracked history under an archive path | user explicitly wanted only the Python porting repo state in Git
Confidence: medium
Scope-risk: broad
Reversibility: messy
Directive: Keep future tracked additions focused on the Python port itself; do not reintroduce the exposed snapshot into Git history
Tested: python3 -m unittest discover -s tests -v; python3 -m src.main summary; git diff --check
Not-tested: Behavioral parity with the original TypeScript system beyond the current Python workspace surface

tests/test_porting_workspace.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+import subprocess
+import sys
+import unittest
+
+from src.port_manifest import build_port_manifest
+from src.query_engine import QueryEnginePort
+
+
+class PortingWorkspaceTests(unittest.TestCase):
+    def test_manifest_counts_python_files(self) -> None:
+        manifest = build_port_manifest()
+        self.assertGreaterEqual(manifest.total_python_files, 7)
+        self.assertTrue(manifest.top_level_modules)
+
+    def test_query_engine_summary_mentions_workspace(self) -> None:
+        summary = QueryEnginePort.from_workspace().render_summary()
+        self.assertIn('Python Porting Workspace Summary', summary)
+        self.assertIn('Command surface', summary)
+        self.assertIn('Tool surface', summary)
+
+    def test_cli_summary_runs(self) -> None:
+        result = subprocess.run(
+            [sys.executable, '-m', 'src.main', 'summary'],
+            check=True,
+            capture_output=True,
+            text=True,
+        )
+        self.assertIn('Python Porting Workspace Summary', result.stdout)
+
+
+if __name__ == '__main__':
+    unittest.main()