Phase 005: vendor ArkScope, land the Arco style baseline, and fix bridge interpreter resolution

- Vendor ArkScope decorative layers (ScrambleTitle / IsometricWave) with provenance notes; decorative-only per AGENTS.md red lines
- Migrate theme tokens to Arco, register the Arco theme, and add hook adapter composables (useMessage / useDialog / useNotification) with matching signatures
- Sample pages: LoginView and AppSidebar on the new baseline; docs/arco-mapping.md and docs/ui-baseline.md land
- agent-bridge: prefer the PM-selected venv from facts.json over legacy in-tree venvs (legacy lacks the mcp extra, so every MCP server showed 0 tools / not connected)
- agent-bridge python (vendored, deliberate deviation): MCP discovery import fallback and pyyaml -> hermes_yaml so plugins and MCP work under the PM env; install the mcp extra via `hermes pm install --extra mcp`
- Chat-chain fragment: docs/chat-chain-changes/2026-10-17-phase005-arkscope-baseline.md

Verified: harness:check, test (2020 passed), test:e2e (30 passed), build all green; manual: plugins 100/0 warnings, MCP 6/6 servers connected with 104 tools.

packages/client/src/composables/useDialog.ts

@@ -0,0 +1,62 @@
+import { Modal } from '@arco-design/web-vue'
+import type { VNodeChild } from 'vue'
+
+// Frozen API (Phase 005). Mirrors the Naive `useDialog` option names used in
+// this repo (positiveText/onPositiveClick/...) and maps them onto Arco Modal.
+// Extend this adapter instead of importing Arco's Modal directly in views.
+
+export interface AppDialogOptions {
+  title?: string
+  content?: string | (() => VNodeChild)
+  positiveText?: string
+  negativeText?: string
+  // Naive semantics: resolving false (or rejecting) keeps the dialog open
+  // and shows no success close; anything else closes it.
+  onPositiveClick?: () => unknown | Promise<unknown>
+  onNegativeClick?: () => unknown | Promise<unknown>
+  onClose?: () => void
+  closable?: boolean
+}
+
+function normalize(options: AppDialogOptions) {
+  return {
+    title: options.title,
+    // RenderContent = string | (() => VNodeChild) — pass functions through;
+    // Arco invokes them itself.
+    content: options.content ?? '',
+    okText: options.positiveText,
+    cancelText: options.negativeText,
+    // Map naive's "resolve false / reject → keep open" onto Arco's onBeforeOk
+    // (async result false keeps the modal open; it also drives ok-button
+    // loading while pending, matching naive).
+    onBeforeOk: options.onPositiveClick
+      ? async (): Promise<boolean> => {
+          try {
+            const result = await options.onPositiveClick!()
+            return result !== false
+          } catch {
+            return false
+          }
+        }
+      : undefined,
+    // Arco's onBeforeCancel is sync-only; a returned promise (naive async
+    // style with no explicit false) counts as "proceed".
+    onBeforeCancel: options.onNegativeClick
+      ? (): boolean => options.onNegativeClick!() !== false
+      : undefined,
+    onClose: options.onClose,
+    closable: options.closable,
+  }
+}
+
+export function useDialog() {
+  return {
+    confirm: (options: AppDialogOptions) => Modal.confirm(normalize(options)),
+    info: (options: AppDialogOptions) => Modal.info(normalize(options)),
+    success: (options: AppDialogOptions) => Modal.success(normalize(options)),
+    error: (options: AppDialogOptions) => Modal.error(normalize(options)),
+    warning: (options: AppDialogOptions) => Modal.warning(normalize(options)),
+  }
+}
+
+export type AppDialog = ReturnType<typeof useDialog>