pmcelhaney / counterfact / 23769709284

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refactor: introduce NormalizedPath branded type for path normalization

Replace ad-hoc .replaceAll("\\", "/") calls with a typed utility:

- Add `NormalizedPath` branded string type and `normalizePath()`
  function in `src/util/normalize-path.ts`
- `ModuleLoader.basePath` is now typed as `NormalizedPath`
- All 13 files that previously called .replaceAll("\\", "/") for
  path normalization now call `normalizePath()` instead

This makes the "path has been normalized" invariant compiler-enforced
in TypeScript code: functions that accept `NormalizedPath` will reject
a plain `string` without an explicit `normalizePath()` call.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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