Protect the global `instance` variable with sync.RWMutex to prevent data races when SetInstance/App() are called concurrently (especially in tests). Changes: - Add instanceMu mutex to protect instance variable - Update App() to use RLock for reading - Update SetInstance() to use Lock for writing - Add GetInstance() for non-panicking access - Add ClearInstance() for test cleanup - Update tests to use new thread-safe functions - Add concurrent access test with race detector Closes #84 Co-authored-by: Claude <noreply@anthropic.com> |
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| core | ||
| framework.go | ||