规则文档改动讨论：PR #668 feat(plugins): unified plugin lifecycle readiness

## 触发原因

PR #668 命中规则文档门：修改了 `docs/dev-rules/plugin-security-and-authoring.md` 和 `docs/dev-rules/protocol-and-submodules.md`。

这些文件是插件安全与授权、协议与子模块的开发规则，属于审查判据自身，变更需要规则放行人确认。

## 需要确认

请规则放行人确认：
1. 规则变更有明确理由且与实现对应
2. 变更不会无意放宽安全或兼容性约束
3. 新增/修改的规则清晰可执行

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*由 review-pr 流程自动创建 · 关联 PR: #668*

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关联 PR:#668(作者 @xxxxxccc);本 issue 由 review-pr 流程自动创建,用于先讨论该 PR 涉及的技术架构调整,聊清楚后 PR 会恢复审查。

Review PR #668 alongside docs/dev-rules/plugin-security-and-authoring.md and docs/dev-rules/protocol-and-submodules.md. Confirm that the rule changes have a clear rationale, match the implementation, preserve security and compatibility constraints, and are executable; the work is done when the designated rule approver confirms them.

Written by the indexing model from the issue text.