merge(chv-muse-round12): 合入 P4 浏览器完全对齐 (1c8fc3f)

冲突按并集解：build.sh 保留 P3 authd 检查/拷入/runcmd（含
start chv-authd）+ P4 三件套检查/拷入（P4 的重复 runcmd 行
删掉——同一文件写两次会盖掉 authd 启动行）+ P4 的
cdp-broker.service/tmpfiles（含 ask-queue）+ P3 叶子模块条件
拷入；buildinfo.py 两边内容项并集；chv-browser.py 取 P4 重构
版（broker 客户端）；production-readiness.md P4 的 §15 顺延为
§16。P2 的 BrowserTest 改走假 CDP broker（断言不变），两路
干跑夹具补齐并集文件集。

chv-guest/build.sh

@@ -200,6 +200,13 @@ if [ -f "$REPO_DIR/cloud/chv/authd.py" ] && [ -f "$REPO_DIR/cloud/chv/sentinel.p
 else
   echo "警告：Muse P3 云端叶子模块不在仓库里（cloud/chv/authd.py 与 sentinel.py），镜像暂不含 authd 叶子模块" >&2
 fi
+# 对齐 Muse P4：CDP broker / guard 共享模块 / 拦截名单三件缺一即失败。
+for p4_file in chv-cdp-broker.py chv_browser_guard.py browser-blocklist.txt; do
+  if [ ! -f "$SCRIPT_DIR/$p4_file" ]; then
+    echo "缺少 $p4_file（Muse P4 客机文件）：$SCRIPT_DIR" >&2
+    exit 1
+  fi
+done
 if [ "$DRY_RUN" = "0" ]; then
   if [ ! -e /dev/kvm ]; then
     echo "CHV_GUEST_BUILD needs a KVM host: /dev/kvm 不存在" >&2
@@ -305,6 +312,10 @@ VC_ARGS=(-a "$OUT/disk.raw"
   --run-command 'mv /usr/local/bin/authd.py /usr/local/bin/chv-authd && chmod +x /usr/local/bin/chv-authd /usr/local/bin/git-credential-chv-authd'
   --run-command 'systemctl enable chv-authd || true'
   --run-command 'printf "runcmd:\n - systemctl restart ssh || service ssh restart || true\n - systemctl start chv-authd || true\n - /usr/local/bin/chv-sync boot >>/var/log/chv-sync.log 2>&1 || true\n" > /etc/cloud/cloud.cfg.d/99-chv-sync.cfg'
+  --copy-in "$SCRIPT_DIR/chv-cdp-broker.py:/usr/local/bin/"
+  --copy-in "$SCRIPT_DIR/chv_browser_guard.py:/usr/local/bin/"
+  --copy-in "$SCRIPT_DIR/browser-blocklist.txt:/usr/local/share/chv/"
+  --run-command 'mv /usr/local/bin/chv-cdp-broker.py /usr/local/bin/chv-cdp-broker && chmod +x /usr/local/bin/chv-cdp-broker && chmod 0644 /usr/local/bin/chv_browser_guard.py /usr/local/share/chv/browser-blocklist.txt'
   --run-command 'git config --system user.name chv && git config --system user.email chv@localhost && git config --system credential.helper store && git config --system init.defaultBranch main'
   --run-command "$GT_INSTALL_CMD"
   --run-command '/usr/local/bin/gt version > /app/guest-versions-gt.txt'
@@ -314,7 +325,8 @@ VC_ARGS=(-a "$OUT/disk.raw"
   --run-command 'useradd --system --home-dir /var/lib/chv-browser --shell /usr/sbin/nologin chv-browser && mkdir -p /var/lib/chv-browser /run/chv/shots && chown chv-browser:chv-browser /var/lib/chv-browser /run/chv/shots && chmod 0755 /run/chv /run/chv/shots'
   --run-command 'printf "[Unit]\nDescription=CHV cell broker (Muse P2)\nAfter=network.target\n\n[Service]\nType=simple\nExecStart=/usr/bin/python3 /usr/local/bin/chv-broker\nRestart=on-failure\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-broker.service'
   --run-command 'printf "[Unit]\nDescription=CHV browser sub-agent (Muse P2)\nAfter=network.target\n\n[Service]\nType=simple\nUser=chv-browser\nGroup=chv-browser\nExecStart=/usr/bin/python3 /usr/local/bin/chv-browser\nRestart=on-failure\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-browser.service'
-  --run-command 'printf "d /run/chv 0755 root root -\nd /run/chv/shots 0755 chv-browser chv-browser -\n" > /etc/tmpfiles.d/chv.conf && systemctl enable chv-broker chv-browser || true')
+  --run-command 'printf "[Unit]\nDescription=CHV CDP broker (Muse P4)\nAfter=network.target\n\n[Service]\nType=simple\nUser=chv-browser\nGroup=chv-browser\nExecStart=/usr/bin/python3 /usr/local/bin/chv-cdp-broker\nRestart=on-failure\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-cdp-broker.service'
+  --run-command 'printf "d /run/chv 0755 root root -\nd /run/chv/shots 0755 chv-browser chv-browser -\nd /run/chv/ask-queue 0750 chv-browser chv-browser -\n" > /etc/tmpfiles.d/chv.conf && systemctl enable chv-broker chv-browser chv-cdp-broker || true')
 # P3 交接（Muse P3 的 authd/sentinel 叶子模块）：文件在仓库里存在时
 # 拷入镜像（本分支已有，合入后自动生效）；不存在时只警告、不失败——
 # M4 既定 build.sh 不硬要求 cloud/，见上。缺叶子模块时 chv-authd