unexport TSLNode.Node field and add SetLeft/SetRight methods

[yaacov]

The internal Node field is now unexported (node), enforcing use of the public API (Type, Value, Clone, SetLeft, SetRight) and preventing callers from bypassing encapsulation or corrupting internal state.

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📥 Commits

Reviewing files that changed from the base of the PR and between da52251 and 3aa3e1b.

📒 Files selected for processing (2)

• v6/pkg/tsl/tsl.go
• v6/pkg/walkers/ident/walk.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch design-unexport-node

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