feat(llm): add scriptable mock fault server

packages/support/llm-mock-server/src/bin.ts

@@ -0,0 +1,50 @@
+#!/usr/bin/env node
+/**
+ * Standalone process wrapper for the scriptable mock LLM server.
+ * @module @deepseek-ai/dsh-llm-mock-server/bin
+ */
+
+import { setTimeout as delay } from 'node:timers/promises'
+import { MOCK_LLM_CLI_USAGE, parseMockLlmCliArgs } from './cli.ts'
+import { startMockLlmServer } from './index.ts'
+
+/* v8 ignore start -- thin process/signal glue; parser and server behavior are covered directly */
+try {
+  const parsed = parseMockLlmCliArgs(process.argv.slice(2))
+  if (parsed.kind === 'help') {
+    process.stdout.write(MOCK_LLM_CLI_USAGE)
+  } else {
+    const { server: serverOptions, listenDelayMs, startsUnavailable } = parsed.config
+    const host = serverOptions.host ?? '127.0.0.1'
+    const port = serverOptions.port ?? 8_000
+    if (startsUnavailable) {
+      process.stdout.write(`${JSON.stringify({
+        type: 'unavailable',
+        baseURL: `http://${host}:${port}/v1`,
+        listenDelayMs,
+      })}\n`)
+      await delay(listenDelayMs)
+    }
+    const server = await startMockLlmServer({
+      ...serverOptions,
+      onEvent: (event) => { process.stdout.write(`${JSON.stringify(event)}\n`) },
+    })
+    process.stdout.write(`${JSON.stringify({
+      type: 'ready',
+      baseURL: `${server.baseURL}/v1`,
+      randomSeed: server.randomSeed,
+    })}\n`)
+    let closing = false
+    const close = (code: number): void => {
+      if (closing) return
+      closing = true
+      void server.close().finally(() => { process.exit(code) })
+    }
+    process.on('SIGINT', () => { close(130) })
+    process.on('SIGTERM', () => { close(143) })
+  }
+} catch (error: unknown) {
+  process.stderr.write(`${error instanceof Error ? error.message : String(error)}\n\n${MOCK_LLM_CLI_USAGE}`)
+  process.exitCode = 1
+}
+/* v8 ignore stop */