Publish a curated docs/ subset (architecture, runbooks, bootstrap ordering)

The initial publish included only `docs/architecture-overview.md`. The upstream demo has a much larger `docs/` tree (as-built, plans, runbooks) that is heavily environment-specific and was intentionally excluded from v1.

**Action**: curate a public-appropriate subset of docs (e.g. an architecture deep-dive, a deploy runbook, and a bootstrap/ordering guide), parameterized with the same `` placeholder scheme, and verified clean by the identifier scan.

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从 docs/architecture-overview.md 开始，并与 upstream demo 更大的 docs/ 树进行对比，重点关注已构建材料、计划和 runbook。选择一份适合公开的架构深度解析、一份部署 runbook 以及一份 bootstrap/排序指南，使用现有的 占位符方案，并运行 identifier scan，以验证整理后的子集是干净的。

由索引模型根据 Issue 内容生成。