code solution for go

gistfile1.txt

build system was silently hanging during compilation instead of failing fast when circular dependencies existed. The dependency resolver was getting stuck in infinite loops rather than detecting cycles.

### What Happened:
```javascript
// These dependencies created a cycle:
const moduleDeps = [
  "UserService>OrderService",
  "OrderService>PaymentService", 
  "PaymentService>UserService"    // Creates cycle!
];

// Build system kept trying to resolve, never terminating
// Developers waited 20+ minutes before killing builds
```

### Your Discovery Process:
1. **Symptom**: Builds randomly hanging on certain feature branches
2. **Investigation**: Added logging to dependency resolution
3. **Root Cause**: Cycle detection was missing from the topological sort
4. **Impact**: 5+ developers losing hours daily to hung builds

### The Fix:
```javascript
function detectCycle(graph) {
    // Your solution: DFS with color marking
    // White (0) = unvisited, Gray (1) = processing, Black (2) = done
    if (dfs(node) && color[neighbor] === 1) {
        throw new Error(`Circular dependency detected: ${cyclePath}`);
    }
}