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

src/port_manifest.py

@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+from collections import Counter
+from dataclasses import dataclass
+from pathlib import Path
+
+from .models import Subsystem
+
+DEFAULT_SRC_ROOT = Path(__file__).resolve().parent
+
+
+@dataclass(frozen=True)
+class PortManifest:
+    src_root: Path
+    total_python_files: int
+    top_level_modules: tuple[Subsystem, ...]
+
+    def to_markdown(self) -> str:
+        lines = [
+            f'Port root: `{self.src_root}`',
+            f'Total Python files: **{self.total_python_files}**',
+            '',
+            'Top-level Python modules:',
+        ]
+        for module in self.top_level_modules:
+            lines.append(f'- `{module.name}` ({module.file_count} files) — {module.notes}')
+        return '\n'.join(lines)
+
+
+def build_port_manifest(src_root: Path | None = None) -> PortManifest:
+    root = src_root or DEFAULT_SRC_ROOT
+    files = [path for path in root.rglob('*.py') if path.is_file()]
+    counter = Counter(
+        path.relative_to(root).parts[0] if len(path.relative_to(root).parts) > 1 else path.name
+        for path in files
+        if path.name != '__pycache__'
+    )
+    notes = {
+        '__init__.py': 'package export surface',
+        'main.py': 'CLI entrypoint',
+        'port_manifest.py': 'workspace manifest generation',
+        'query_engine.py': 'port orchestration summary layer',
+        'commands.py': 'command backlog metadata',
+        'tools.py': 'tool backlog metadata',
+        'models.py': 'shared dataclasses',
+        'task.py': 'task-level planning structures',
+    }
+    modules = tuple(
+        Subsystem(name=name, path=f'src/{name}', file_count=count, notes=notes.get(name, 'Python port support module'))
+        for name, count in counter.most_common()
+    )
+    return PortManifest(src_root=root, total_python_files=len(files), top_level_modules=modules)