Increase file transfer timeout to 5 minutes for R1/4 testing

R1/4 at 62 bytes/frame needs ~165 frames for 10KB, which takes ~135s
on good fading. The old 120s timeout was too short.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: secup

tools/cli_simulator.cpp

@@ -1722,7 +1722,7 @@ class CLISimulator {
             auto now = std::chrono::steady_clock::now();
             auto elapsed = std::chrono::duration_cast<std::chrono::seconds>(now - start).count();
 
-            if (elapsed >= 120) {  // 2 minute timeout for file transfer
+            if (elapsed >= 300) {  // 5 minute timeout for file transfer (R1/4 needs ~2min for 10KB)
                 std::cout << "  \033[31m✗ File transfer timeout!\033[0m\n";
                 return false;
             }