Complete Classic COM infrastructure support

[leileizhang (lei9444)]

Summary

• complete generated IPropertyStore support and add a deterministic live ShellLink property round trip
• initialize and validate BIND_OPTS.cbStruct from exact multi-architecture layout metadata
• complete IStream generation with owned STATSTG projection and CoTaskMem cleanup
• add exact-contract IMalloc projection with opaque allocator-bound allocations and borrowed cross-allocator DidAlloc inspection
• expose CoGetClassObject, CoGetMalloc, and COM error-info acquisition with owned references and thread-local semantics
• add generated/live coverage for IClassFactory, ICreateErrorInfo, and IErrorInfo
• raise the complete Classic COM census to 5,567 / 7,929 interfaces (70.210619%)

Safety

• keep direct pointer returns fail-closed outside exact registered contracts
• reject forged, stale, consumed, and wrong-allocator allocation use where allocator identity is required
• free nested STATSTG.pwcsName on success, HRESULT failure, conversion failure, and drop
• validate exact declaring interface IID, vtable slot, method shape, layout, ownership, and cleanup evidence
• preserve existing WinRT behavior and the npm root export surface

Validation

• cargo test -p dynwinrt — 218 passed, 1 ignored
• cargo test -p dynwinrt-codegen — 444 passed
• JavaScript binding tests — 36 passed, 1 skipped
• Classic COM E2E — 16/16 passed
• x64 and i686 Rust/codegen/JS compile checks passed

[github-actions]

Mixed-language test coverage

Workflow status: ✅ Passed

Layer	Lines	Functions	Branches/regions
Rust, including native .pyd/.node	81.26%	77.72%	81.19% regions
Generated Python projections	77.01%	n/a	62.35% branches
JavaScript aggregate	18.77%	20.83%	52.26% branches
JavaScript runtime	19.91%	14.28%	7.14% branches
Generated WinRT projections	22.27%	20.02%	52.85% branches
Generated Classic COM projections	12.97%	23.45%	52.17% branches

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