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/e2e/native-main-lifecycle.spec.ts

@@ -0,0 +1,27 @@
+import { expect, test } from "@playwright/test";
+import fs from "node:fs";
+import path from "node:path";
+
+test("repeated native object creation and deletion survives serialization", async ({ page }) => {
+  await page.goto("/");
+  const bytes = fs.readFileSync(path.resolve(import.meta.dirname, "../../../tests/files/web/basic_scene.blend"));
+  const result = await page.evaluate(async (input) => {
+    const { WebEngineClient } = await import("/src/engine-client/WebEngineClient.ts");
+    const client = new WebEngineClient();
+    let cycle = 0;
+    try {
+      const opened = await client.openBlend(Uint8Array.from(input).buffer);
+      await client.saveBlend();
+      for (; cycle < 10; cycle++) {
+        const added = await client.applyCommand({ type: "createPrimitive", primitive: "CUBE", location: [0, 0, 0] });
+        if (added.snapshot.nodes.length !== opened.snapshot.nodes.length + 1) throw new Error("creation count mismatch");
+        const removed = await client.applyCommand({ type: "deleteObject", objectId: added.snapshot.activeObjectId! });
+        if (removed.snapshot.nodes.length !== opened.snapshot.nodes.length) throw new Error("deletion count mismatch");
+        await client.saveBlend();
+      }
+      return { cycle };
+    } catch (error) { throw new Error(JSON.stringify({ cycle, error })); }
+    finally { client.terminate(); }
+  }, Array.from(bytes));
+  expect(result.cycle).toBe(10);
+});