fix(log): make global logger thread-safe with atomic.Pointer

[skevetter]

Summary

The global sugar variable in pkg/log/logger.go was an unprotected *zap.SugaredLogger pointer. Concurrent reads from log functions (e.g. log.Debug() in deferred calls in pkg/inject/inject.go) and writes from test cleanup (t.Cleanup restoring sugar in pkg/log/testing.go) caused data races detected by Go's race detector in CI run 24964563286.

The race was introduced by #147, which added defer log.Debug(...) calls in inject.go that fire after goroutines send to channels — creating concurrent access with test cleanup writing to sugar.

This replaces the bare *zap.SugaredLogger pointer with atomic.Pointer[zap.SugaredLogger]. All reads go through sugar.Load() and all writes through sugar.Store(), making the global logger safe for concurrent access with zero behavioral changes.

Files changed: pkg/log/logger.go, pkg/log/testing.go, pkg/log/levels.go, pkg/log/writer.go

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📥 Commits

Reviewing files that changed from the base of the PR and between e060069 and e70f82f.

📒 Files selected for processing (4)

• pkg/log/levels.go
• pkg/log/logger.go
• pkg/log/testing.go
• pkg/log/writer.go

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