Spike: PTY-based Claude Code integration with multi-agent concurrency

Proves that spawning `claude -p` in a pseudo-terminal from Rust gets Max
subscription billing (apiKeySource: "none", rateLimitType: "five_hour")
instead of per-token API charges. Concurrent agents run in parallel PTY
sessions with session resumption via --resume for multi-turn conversations.

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

frontend/vite.config.ts

@@ -5,8 +5,9 @@ import { defineConfig } from "vite";
 export default defineConfig(() => ({
   plugins: [react()],
   server: {
+    port: 5174,
     proxy: {
-      "/api": "http://127.0.0.1:3001",
+      "/api": "http://127.0.0.1:3002",
     },
   },
   build: {