Fix test runner paths, all 203 tests pass

Spec tests (Python host): 43 CEK + 24 continuations + 90 types = 157
Web tests (Python host): 20 signals + 26 CEK reactive = 46
Total: 203 tests, 0 failures.

Fixed: continuation test bootstrapper path, type test spec dir path.
Both bootstrappers verified: Python (5993 lines), JS (387KB).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hosts/python/tests/run_continuation_tests.py

@@ -12,7 +12,7 @@ sys.path.insert(0, _PROJECT)
 # Bootstrap a fresh sx_ref with continuations enabled
 print("Bootstrapping with --extensions continuations ...")
 result = subprocess.run(
-    [sys.executable, os.path.join(_HERE, "bootstrap_py.py"),
+    [sys.executable, os.path.join(_HERE, "..", "bootstrap.py"),
      "--extensions", "continuations"],
     capture_output=True, text=True, cwd=_PROJECT,
 )