fix(hir): resolve CJS worker path joins

[JagritGumber]

Summary

• Normalize Windows source paths before lowering __dirname and import.meta path fields.
• Let the static import/worker filename resolver fold deterministic CommonJS path shapes like string .replace(...) and path.default.join(...).
• Add regression coverage for the Windows node-pty worker path shape and closure-contained WorkerNew discovery.

Why

Some CommonJS packages construct worker entry filenames through deterministic path expressions instead of direct literals. One concrete shape is path.join(__dirname.replace(...), "worker/file.js"). Before this change Perry could not resolve that worker filename, so module collection stopped before the worker module was registered.

This does not add native .node addon loading. In the node-pty probe, this change gets Perry past worker module collection and compilation; executing the compiled probe still reaches the existing native-addon boundary at require("./prebuilds/win32-x64/pty.node").

Tests

• cargo fmt -p perry-hir --check
• cargo test -p perry-hir dynamic_import::tests --message-format=short