fix: LLM health check via mcplocal instead of spawning gemini directly

Status command now queries mcplocal's /llm/health endpoint instead of
spawning the gemini binary. This uses the persistent ACP connection
(fast) and works for any configured provider, not just gemini-cli.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/mcplocal/src/http/server.ts

@@ -81,6 +81,34 @@ export async function createHttpServer(
     reply.code(200).send({ status: 'ok' });
   });
 
+  // LLM health check — tests the active provider with a tiny prompt
+  app.get('/llm/health', async (_request, reply) => {
+    const provider = deps.providerRegistry?.getActive() ?? null;
+    if (!provider) {
+      reply.code(200).send({ status: 'not configured' });
+      return;
+    }
+    try {
+      const result = await provider.complete({
+        messages: [{ role: 'user', content: 'Respond with exactly: ok' }],
+        maxTokens: 10,
+      });
+      const ok = result.content.trim().toLowerCase().includes('ok');
+      reply.code(200).send({
+        status: ok ? 'ok' : 'unexpected response',
+        provider: provider.name,
+        response: result.content.trim().slice(0, 100),
+      });
+    } catch (err) {
+      const msg = (err as Error).message ?? String(err);
+      reply.code(200).send({
+        status: 'error',
+        provider: provider.name,
+        error: msg.slice(0, 200),
+      });
+    }
+  });
+
   // Proxy management routes to mcpd
   const mcpdClient = new McpdClient(config.mcpdUrl, config.mcpdToken);
   registerProxyRoutes(app, mcpdClient);