Implement RWLock in internalArtifacts to prevent data races

[git-hulk]

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[gemini-code-assist]

Summary of Changes

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This pull request integrates a read-write mutex into the internalArtifacts mechanism to resolve potential data races. The core objective is to guarantee thread-safe updates when tracking artifact versions, specifically preventing concurrent operations from corrupting data or allowing older artifact versions to inadvertently overwrite newer ones. This change significantly improves the robustness and reliability of artifact management within a concurrent execution environment.

Highlights

• Concurrency Control: Introduced a sync.RWMutex to the internalArtifacts struct in both internal/context/callback_context.go and internal/toolinternal/context.go to prevent data races during artifact version tracking.
• Thread-Safe Updates: Implemented explicit locking (ia.mu.Lock() and defer ia.mu.Unlock()) around modifications to the eventActions.ArtifactDelta map, ensuring thread-safe access.
• Version Management: Enhanced the artifact saving logic to conditionally update ArtifactDelta, ensuring that only the newest version of an artifact is stored, preventing older versions from overwriting more recent ones.
• New Test Coverage: Added a new test file, internal/context/callback_context_test.go, which includes TestInternalArtifactsSaveKeepsNewestVersion to validate the correct behavior of the new version-keeping logic.

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[gemini-code-assist]

Code Review

The pull request introduces a sync.RWMutex to the internalArtifacts struct in internal/context/callback_context.go and internal/toolinternal/context.go to protect concurrent writes to eventActions.ArtifactDelta within the Save method. The Save method's logic was also updated to ensure that ArtifactDelta always stores the newest version of an artifact. A new test file, internal/context/callback_context_test.go, was added with TestInternalArtifactsSaveKeepsNewestVersion to verify this versioning logic. The reviewer acknowledged the value of the new versioning test but requested an additional concurrency test to explicitly confirm that the added mutex effectively prevents data races when Save is called concurrently from multiple goroutines.