refactor(tests): reuse source map node walker - #101
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Replace three specialized AST walkers with nodesOfType.
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What changed
Why
The four helpers implemented the same recursive AST traversal.
One generic helper removes duplicate test infrastructure.
Impact
Test coverage and runtime behavior do not change.
Splitting source-map.spec.ts remains a separate follow-up change.
Validation
All 1,961 tests pass.