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.

tests/client/sidebar-search.test.ts

@@ -80,28 +80,33 @@ vi.mock('@/components/common/RouteLinkItem.vue', () => ({
   },
 }))
 
-vi.mock('naive-ui', async () => {
-  const actual = await vi.importActual<any>('naive-ui')
-  return {
-    ...actual,
-    useMessage: () => ({
-      success: vi.fn(),
-      error: vi.fn(),
-    }),
-    NButton: {
-      template: '<button v-bind="$attrs"><slot /></button>',
-    },
-    NModal: {
-      props: ['show'],
-      template: '<div v-if="show" class="n-modal-stub"><slot /></div>',
-    },
-    NSelect: {
-      template: '<div />',
-    },
-  }
-})
+vi.mock('naive-ui', () => ({
+  // AppSidebar no longer imports naive-ui; keep the module inert for any
+  // transitive import during the Arco migration.
+  useMessage: () => ({
+    success: vi.fn(),
+    error: vi.fn(),
+  }),
+}))
 
 import AppSidebar from '@/components/layout/AppSidebar.vue'
+import { config } from '@vue/test-utils'
+
+// Arco components are globally registered in main.ts; register test stubs
+// here with the same contract the sidebar relies on.
+config.global.stubs = {
+  'a-button': {
+    template: '<button class="a-button-stub" v-bind="$attrs"><slot /></button>',
+  },
+  'a-modal': {
+    props: ['visible'],
+    emits: ['update:visible'],
+    template: '<div v-if="visible" class="a-modal-stub"><slot /></div>',
+  },
+  'a-tag': {
+    template: '<span class="a-tag-stub"><slot /></span>',
+  },
+}
 
 function fakeJwt(payload: Record<string, unknown>) {
   return `header.${btoa(JSON.stringify(payload)).replace(/=/g, '')}.signature`
@@ -131,7 +136,6 @@ describe('AppSidebar navigation', () => {
           ModelSelector: true,
           LanguageSwitch: true,
           ThemeSwitch: true,
-          NButton: true,
         },
       },
     })
@@ -150,7 +154,6 @@ describe('AppSidebar navigation', () => {
           ModelSelector: true,
           LanguageSwitch: true,
           ThemeSwitch: true,
-          NButton: true,
         },
       },
     })
@@ -179,7 +182,6 @@ describe('AppSidebar navigation', () => {
           ModelSelector: true,
           LanguageSwitch: true,
           ThemeSwitch: true,
-          NButton: true,
         },
       },
     })