Whitelist confirmation: #1247 chore: centralize ipc channel constants

PR #1247 触发 **security + rules + arch** 白名单确认门。

**触发原因**：
- security：新增第三方依赖 ws / typescript，影响用户隐私/系统安全
- rules：改动规则文档 AGENTS.md（审查判据自身变更）
- arch：核心路径改动 1571 行（≥ 150）+ huge-diff（1580 行 ≥ 800）

**放行方式**：放行名单成员在 PR https://github.com/makecindy/cindy/pull/1247 上提交 GitHub Approve 即放行；如需修改请 Request Changes，作者改完后重新 Approve。

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关联 PR:#1247(作者 @codeingforcoffee);本 issue 由 review-pr 流程自动创建,用于先讨论该 PR 涉及的安全敏感改动,维护者确认后 PR 会恢复推进。

Start by reading PR #1247, especially its changes to AGENTS.md and the centralized IPC channel constants. Review the stated ws and TypeScript security implications and the 1,571-line core-path change. Done means an allowlisted maintainer submits GitHub Approve on PR #1247, or requests changes if needed.

Written by the indexing model from the issue text.