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Archive superseded design/bugs docs under old/, point architecture at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.

package.json

@@ -9,8 +9,8 @@
     "prod:start": "node scripts/prod-build-start.js"
   },
   "devDependencies": {
-    "@playwright/test": "^1.56.1",
-    "playwright": "^1.56.1"
+    "@playwright/test": "1.61.1",
+    "playwright": "1.61.1"
   },
   "dependencies": {
     "@e965/xlsx": "0.20.3",