chore: checkpoint web Blender migration source, tools and docs

Accumulated uncommitted work: GHOST Web backend, WebGL/GPU web layer,
web workflow engine and protocol, tooling, docs and task records.
Large generated evidence, user-testing archives, build snapshots and
imported test assets remain untracked.

Co-Authored-By: Claude Code <noreply@anthropic.com>

my-tools/wbv2_execution_phase.py

@@ -0,0 +1,19 @@
+"""Persistent implementation phase shared by local recipes and the supervisor."""
+
+import json
+from pathlib import Path
+
+
+def _preferences(root):
+    path = Path(root) / "tests/golden/WBV2/autopilot/preferences.json"
+    return json.loads(path.read_text()) if path.is_file() else {}
+
+
+def implementation_only(root):
+    return _preferences(root).get("verificationTiming") == "after_all_features"
+
+
+def verification_blocked(root):
+    preferences = _preferences(root)
+    return (preferences.get("verificationTiming") == "after_all_features"
+            and preferences.get("allFeaturesImplemented") is not True)