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Archive superseded design/bugs docs under old/, point architecture at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/reference/7-46-document-evidence-retrieval-kernel-v1.md

@@ -17,7 +17,7 @@
 > - `/mnt/Data1T/mnote/design/07-ai/process/7-18-local-first-agent-file-editing-control-plane-v1.md`
 > - `/mnt/Data1T/mnote/design/07-ai/done/7-40-page-ai-context-envelope-and-run-receipt-v1.md`
 >
-> 参考项目：`reference-code/PageIndex`、`reference-code/BookRAG`、`reference-code/Kwipu`、`reference-code/ladybug`、`reference-code/seekdb` 均已单独建 CodeGraph；本文只吸收架构和合同，不把这些项目整体引入运行时。
+> 参考项目：`reference-code/PageIndex`、`reference-code/BookRAG`、`reference-code/Kwipu`、`reference-code/ladybug` 曾用于架构取证；`seekdb` 本地副本已在 2026-07 清理。本文只保留架构和合同结论，不把这些项目整体引入运行时。
 
 ## 1. 第一结论