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_runtime_contract.py

@@ -0,0 +1,21 @@
+"""Bind the known source build to local runtime publication, including hashes."""
+
+
+def bind_runtime_publication(result):
+    matched = False
+    for check in result["checks"]:
+        argv = check["argv"]
+        if "source_build" in check["kinds"] and "cmake" in argv and "build_web_blender6" in argv and "web_engine" in argv:
+            check["argv"] = ["python3", "my-tools/build_local_webengine.py"]
+            check["cwd"] = "."
+            matched = True
+    if matched:
+        result["dependencies"] = sorted(set(result["dependencies"] + ["my-tools/build_local_webengine.py", "tools/web/sync-web-engine-runtime.mjs"]))
+        result["artifacts"] = sorted(set(result["artifacts"] + ["web/app/public/wasm-module-manifest.json", "web/app/public/vendor/blender/web_engine.js", "web/app/src/vendor/blender/web_engine.js", "web/app/src/vendor/blender/web_engine.wasm"]))
+    if ("web/app/src/app/App.tsx" in result.get("dependencies", [])
+            and any("chromium" in check.get("kinds", []) for check in result.get("checks", []))):
+        dependencies = set(result.get("dependencies", []))
+        dependencies.update(("my-tools/wbv2_runtime_contract.py",
+                             "web/app/src/three-adapter/viewport.ts"))
+        result["dependencies"] = sorted(dependencies)
+    return result