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/login-view.test.ts

@@ -33,6 +33,25 @@ vi.mock('@/api/auth', () => ({
 }))
 
 import LoginView from '@/views/LoginView.vue'
+import { config } from '@vue/test-utils'
+
+// Arco components are registered globally in main.ts; stub a-input as a
+// real <input> so v-model setValue still works in tests.
+config.global.stubs = {
+  'a-input': {
+    props: ['modelValue'],
+    emits: ['update:modelValue'],
+    methods: {
+      // Real a-input exposes focus(); LoginView calls it on mount.
+      focus() {},
+    },
+    template:
+      '<input :value="modelValue" @input="$emit(\'update:modelValue\', $event.target.value)" />',
+  },
+  'a-button': {
+    template: '<button type="button" v-bind="$attrs"><slot /></button>',
+  },
+}
 
 describe('LoginView password login', () => {
   beforeEach(() => {