fix: close PI-140 cutover gaps

Back up unknown legacy Agents, reconnect settled Conversation observation, remove remaining active repository residue, and restore the bundled Python verifier import.

scripts/verify-bundled-python.mjs

@@ -1,6 +1,7 @@
 #!/usr/bin/env node
 
 import { spawnSync } from 'node:child_process';
+import path from 'node:path';
 import { getPythonTarget, PYTHON_VERSION } from './bundled-python-manifest.mjs';
 
 function readOption(name) {