docs(governance): 登记 FLK-002 发送按钮偶发禁用 flake

[DeliciousBuding]

登记 FLK-002：web stubbed-hub chat-flow-contract 发送按钮偶发禁用超时

按 known-flaky 纪律「重跑留痕、当日回填」：2026-08-25 #1981 车道 Web stubbed-hub E2E (path-filtered) 出现一次偶发红（发送按钮 toBeEnabled 20s 超时），本机同提交复跑 2/2 绿，gh run rerun --failed 转绿。本 PR 当日补登 FLK-002 条目（含复现命令、到期复审日 2026-09-24、处置记录），并更新「最后更新」行。

• 登记表字段合同、到期规则不变；无重试预算变更。
• python scripts/verify/verify-doc-ssot.py PASS。

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