Fix WinRT JavaScript runtime-class interface input typing

[leileizhang (lei9444)]

Problem

WinRT runtime classes merge overload names while standalone interfaces retain explicit WinMD aliases. Native StorageFile inputs work with FileIO, but strict TypeScript rejects StorageFile as IStorageFile and StorageFolder as IStorageFolder because the class declarations lack those aliases.

Fix

Retain original instance-method aliases during JavaScript projection and emit real JS methods with matching declarations after overload merging. Aliases preserve the declaring interface, vtable slot, conversion, and async behavior. Existing class dispatchers, interface aliases, and .as(...) views remain unchanged; existing public members win name collisions. No input-type widening, native ABI/production runtime behavior, Python, or release/version changes.

A separate CI prerequisite accepts trailing commas in the existing test-hook stub macro and formats two invocations for hosted rustfmt. Its native argument tokens and function bodies are unchanged. Test paths are canonicalized to handle hosted runner short-name aliases without weakening destination checks.

Verification

• TypeScript 5.9.3 --strict --skipLibCheck false: the original natural FileIO/copy repro fails before and passes after. Positive file/folder/IStorageItem/IBuffer/IStringable inputs, legacy names and explicit views pass; unrelated Uri and wrong file/folder inputs remain rejected.
• Real isolated-file roundtrips on ARM64 and x64: CJS/ESM, five independent/incremental generation selections, all copy/move alias shapes and existing overloads, AbortSignals, and compiled direct-module/package consumers. Existing Storage class bodies and standalone interface output compare unchanged; classes intentionally gain aliases.
• Generator units/snapshots and execution traces verify aliases, original slots/QI, numeric merges, and collision precedence. Formatting, lint, and two-architecture test-hook compilation pass.
• Exact head 6258cc1950d0058aef02ec99a6be107e7db43558: Build, mixed-language coverage, and Python artifact verification all pass, including the hosted x64 strict-TS/native matrix. Release publication remains skipped.

[github-actions]

Mixed-language test coverage

Workflow status: ✅ Passed

Layer	Lines	Functions	Branches/regions
Rust, including native .pyd/.node	86.93%	82.48%	86.65% regions
Python aggregate	72.34%	n/a	39.42% branches
Python runtime	98.17%	n/a	94.57% branches
Generated Python WinRT projections	71.07%	n/a	33.5% branches
Generated Python WinRT implementations	71.97%	n/a	46.3% branches
JavaScript aggregate	21.6%	24.93%	57.61% branches
JavaScript runtime	44.27%	45.76%	78.99% branches
Generated WinRT projections	22.64%	18.43%	54.84% branches
Generated WinRT implementations	45.99%	59.19%	60.97% branches
Generated Classic COM projections	11.52%	23.97%	53.4% branches

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