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/useMessage.ts

@@ -0,0 +1,53 @@
+import { Message } from '@arco-design/web-vue'
+import type { MessageConfig, MessageReturn } from '@arco-design/web-vue/es/message/interface'
+
+// Frozen API (Phase 005). Naive-style call sites migrate here; extend this
+// adapter instead of importing Arco's Message directly in views/components.
+// Naive: message.success(text, { duration }) — Arco only accepts
+// (config, appContext), so options must be merged into the config object.
+
+export interface AppMessageOptions {
+  content: string
+  duration?: number
+  closable?: boolean
+}
+
+export type AppMessageContent = string | AppMessageOptions
+
+export interface AppMessageCallOptions {
+  duration?: number
+  closable?: boolean
+}
+
+function toConfig(content: AppMessageContent, options?: AppMessageCallOptions): MessageConfig {
+  const config: MessageConfig =
+    typeof content === 'string' ? { content } : { ...content }
+  if (options?.duration !== undefined) config.duration = options.duration
+  if (options?.closable !== undefined) config.closable = options.closable
+  return config
+}
+
+// Naive's MessageReactive exposes destroy(); Arco's MessageReturn only
+// exposes close(). Expose both so migrated call sites can use either.
+export type AppMessageReturn = MessageReturn & { destroy: () => void }
+
+function wrap(ret: MessageReturn): AppMessageReturn {
+  return { ...ret, destroy: () => ret.close() }
+}
+
+export function useMessage() {
+  return {
+    success: (content: AppMessageContent, options?: AppMessageCallOptions) =>
+      wrap(Message.success(toConfig(content, options))),
+    error: (content: AppMessageContent, options?: AppMessageCallOptions) =>
+      wrap(Message.error(toConfig(content, options))),
+    warning: (content: AppMessageContent, options?: AppMessageCallOptions) =>
+      wrap(Message.warning(toConfig(content, options))),
+    info: (content: AppMessageContent, options?: AppMessageCallOptions) =>
+      wrap(Message.info(toConfig(content, options))),
+    loading: (content: AppMessageContent, options?: AppMessageCallOptions) =>
+      wrap(Message.loading(toConfig(content, options))),
+  }
+}
+
+export type AppMessage = ReturnType<typeof useMessage>