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Archive superseded design/bugs docs under old/, point architecture at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

scripts/qa-block-handle-menu.js

@@ -678,7 +678,9 @@ async function main() {
     result.pass = result.failures.length === 0;
   } catch (err) {
     result.steps.push({ step: "exception", status: "fail", message: String(err) });
-    await screenshot("99-error").catch(() => {});
+    await page
+      .screenshot({ path: path.join(SCREENSHOT_DIR, "99-error.png"), fullPage: false })
+      .catch(() => {});
   } finally {
     await browser.close();
   }