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/query_engine.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from .commands import PORTED_COMMANDS, build_command_backlog
+from .port_manifest import PortManifest, build_port_manifest
+from .tools import PORTED_TOOLS, build_tool_backlog
+
+
+@dataclass
+class QueryEnginePort:
+    manifest: PortManifest
+
+    @classmethod
+    def from_workspace(cls) -> 'QueryEnginePort':
+        return cls(manifest=build_port_manifest())
+
+    def render_summary(self) -> str:
+        command_backlog = build_command_backlog()
+        tool_backlog = build_tool_backlog()
+        sections = [
+            '# Python Porting Workspace Summary',
+            '',
+            self.manifest.to_markdown(),
+            '',
+            f'{command_backlog.title}: {len(PORTED_COMMANDS)} mirrored entries',
+            *command_backlog.summary_lines()[:10],
+            '',
+            f'{tool_backlog.title}: {len(PORTED_TOOLS)} mirrored entries',
+            *tool_backlog.summary_lines()[:10],
+        ]
+        return '\n'.join(sections)