chore: land tree view-state, vault, Pi module split, and repo hygiene

Persist PageTree expand state via control-plane view-state and align
chevron/DOM with restored expansion; keep Sidex-style shallow page-tree
scan and drop the unused recursive scanner that only added cargo noise.

Add password vault workbench routes/runtime/skill/CLI, split page_ai_pi
into a module package, and retire Hermes/ACP/OpenHub recycle + root
harness evidence from the index while gitignoring recycle and local
diag dumps.

Archive superseded design/bugs docs under old/, point architecture at
ARCHITECTURE.md, and refresh smokes for Pi S1–S7, vault, and editor
regressions so the working tree can stay clean.

design/07-ai/done/7-55-lightrag-docx-citation-rerank-alignment-v1.md

@@ -4,14 +4,14 @@
 >
 > 当前状态：`done`
 >
-> 2026-07-03 口径回正：当前 runtime 已回到 OpenHub / native agent + LightRAG + Turso/libSQL。本文重新作为当前默认 LightRAG provider 的 DOCX 引用与定位合同基线；此前 `7-68 OpenHub + WeKnora + MNote Page AI 深度融合` 中将 WeKnora 设为默认 provider 的口径已标记 stale。
+> 2026-07-19 口径回正：当前 runtime 是 Pi Rust Page AI + LightRAG + Turso/libSQL。本文保留为当前默认 LightRAG provider 的 DOCX 引用与定位合同基线；WeKnora 仅为历史/备用边界。
 >
 > Owner：07-ai / knowledge-rag / 03-rust-web / office-preview
 >
 > 关联：
 > - `design/07-ai/done/7-50-lightrag-knowledge-rag-provider-v1.md`
 > - `design/07-ai/done/7-51-lightrag-post-commit-hardening-v1.md`
-> - `design/07-ai/process/7-54-raganything-multimodal-retrieval-alignment-v1.md`
+> - `design/07-ai/reference/7-54-raganything-multimodal-retrieval-alignment-v1.md`
 >
 > 参考代码：
 > - LightRAG：`/mnt/Data1T/Mnote_data/lightrag/LightRAG`