[verify-anchor] p30/F09 intent 协议链路验证锚点（可复用，非真实工作项）

verify-intent-chain.sh 需要一个真实 issue 作为意图消息链的锚点（GitHub 双写投影会往这条 issue 下评论 blocker/escalate/decide/assign 四类结构化评论）。本 issue 专门用作这个验证脚本的复用锚点，不代表真实工作项，评论内容是 harness verify 产生的测试数据。

Start with verify-intent-chain.sh and confirm that this issue is used as the reusable intent-chain anchor. Check that harness-generated comments cover blocker, escalate, decide, and assign, and that the issue remains clearly identified as test data rather than a real work item.

Written by the indexing model from the issue text.