refactor(source-map): narrow internal traversal types - #102
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Use a structural node type and explicit string-field narrowing. Keep upstream compiler internals typed as any.
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What changed
Why
The traversal used any for nodes owned by this project.
The new type documents the fields that traversal logic reads.
Scope
The upstream compiler boundary keeps its existing any types.
This change does not model undocumented micromark internals.
Impact
Runtime behavior and the public API do not change.
Validation
All 1,961 tests pass.