Fix WinRT JavaScript runtime-class interface input typing - #208

Problem

StorageFile works with FileIO at runtime, but strict TypeScript rejects it as IStorageFile. StorageFolder has the same mismatch with IStorageFolder: classes merge overload names, while interfaces retain explicit aliases that the classes no longer expose.

Fix

Preserve metadata-projected instance aliases during overload merging and emit them as real JavaScript methods with matching declarations. Each alias keeps its declaring interface, QI, vtable slot and conversions. Existing class overloads, standalone interfaces and .as(...) views remain unchanged; existing public members take precedence on name collisions.

This adds interface-compatible class methods rather than widening inputs to any or declaring methods that do not exist at runtime. No native ABI, Python or release changes.

Verification

• The original natural file/folder consumer now passes strict TypeScript and real temporary-file operations on ARM64 and x64. Unrelated Uri and wrong file/folder inputs remain rejected.
• CJS/ESM tests cover independent/incremental generation, copy/move aliases and canonical overloads, AbortSignals and legacy interface views. Generator tests verify dispatch slots, QI and collision precedence.
• Final-head Build, coverage and Python artifact checks passed.

Supporting CI-only changes format existing test-hook macros and compare canonical file identities on Windows runners; they do not change production dispatch.