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>

web/tests/fixtures/server-operator-runner.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""Transport test double, not Blender behavioral evidence."""
+import hashlib
+import json
+import os
+from pathlib import Path
+import signal
+import sys
+import time
+
+envelope = json.load(sys.stdin)
+request = envelope["request"]
+root = Path(envelope["workspaceRoot"])
+mode = request["properties"].get("mode", "success")
+if mode == "signal":
+    os.kill(os.getpid(), signal.SIGTERM)
+time.sleep(10 if mode == "slow" else 0.4)
+if mode == "malformed":
+    (root / "result.json").write_text("{")
+    sys.exit(0)
+result = {key: request[key] for key in (
+    "schemaVersion", "route", "jobId", "sourceBlendSha256", "sourceRevision",
+    "blenderBuild", "propertiesSha256", "requestSha256",
+)}
+data = b"transport-result"
+result.update(status="SUCCEEDED", result=["FINISHED"],
+              resultSha256=hashlib.sha256(b'["FINISHED"]').hexdigest(),
+              resultBlendByteLength=len(data),
+              resultBlendSha256=hashlib.sha256(data).hexdigest())
+if mode == "bad-hash":
+    result["resultBlendSha256"] = "0" * 64
+if mode == "bad-binding":
+    result["sourceRevision"] += 1
+(root / "result.blend").write_bytes(data)
+(root / "result.json").write_text(json.dumps(result))