feat(llm): add scriptable mock fault server

packages/support/llm-mock-server/tests/invariant.spec.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import InvariantService from '@deepseek-ai/dsh-invariants'
+import * as MockServerInvariant from '../src/invariant.ts'
+
+describe('mock LLM server invariant companion', () => {
+  it('registers its explained empty runtime invariant', async () => {
+    const ctx = new Context()
+    await ctx.plugin(InvariantService)
+    const fiber = await ctx.plugin(MockServerInvariant)
+
+    expect(() => {
+      ctx.invariants.register('@deepseek-ai/dsh-llm-mock-server', () => {})
+    }).toThrow(/already registered/)
+    await fiber.dispose()
+    await ctx.fiber.dispose()
+  })
+})