chore: 保存当前架构收口与 bug 修复快照

归档本轮 P0/P1 bug 修复、设计审查迁移、AI selection scope 收口与 stream contract 调整，并保留当前 05 主线迁移起点。

scripts/task-page-block-ai-conflict-idempotency-smoke.js

@@ -16,6 +16,7 @@ const {
 } = require("./tree-shell-smoke-helpers");
 
 const OUT_DIR = path.join(process.cwd(), "tmp", "page-block-ai-conflict-idempotency-smoke");
+const CHROME_EXECUTABLE = process.env.PLAYWRIGHT_CHROME_EXECUTABLE || "";
 
 async function callMnoteTool(request, payload) {
   return requestJson(request, "/api/hermes/tools/mnote/call", {
@@ -87,7 +88,11 @@ async function main() {
   };
   await fs.mkdir(OUT_DIR, { recursive: true });
 
-  const browser = await chromium.launch({ headless: true });
+  const browser = await chromium.launch({
+    headless: true,
+    ...(CHROME_EXECUTABLE ? { executablePath: CHROME_EXECUTABLE } : {}),
+    args: ["--no-sandbox", "--disable-dev-shm-usage"],
+  });
   const context = await browser.newContext({ viewport: { width: 1280, height: 900 } });
   const page = await context.newPage();