Prepare Game 0.17 packages with Box2D and portal consumer qualification

[EHotwagner]

Prepares the stable Game 0.17.0 coherent set on the protected Box2D/portal source: Core, Render, Harness and Physics.Box2D. Existing packages compare against their published 0.16.0 API baseline; the adapter's first release validates its current package without requesting a nonexistent predecessor. Updates the four-package custody/readback gates while retaining one coherent preparation, original bytes, GitHub Packages before public NuGet/OIDC and authenticated recovery without repacking.

The independent package consumer copies both real headless scenes outside the checkout and compiles solely against restored packages. Candidate qualification uses a fresh cache and candidate-only mapping for Game packages; public qualification uses only nuget.org after genuine both-feed publication/readback. It exercises the falling body/joint/sensor scene and the rotated whole-body portal scene, with exact recorded-input replay and package dependency/API checks.

Validation:

• Existing-path static preflight runs before expensive release restore/build/tests. Good configuration passed; disabled first/second/both pushes, wrong scalar/API baseline, missing fourth-package custody and missing/foreign/wrong-version artifacts refused before consumer work. Custom modeling was deferred because the existing effect ordering and recovery route are unchanged.
• Actual restore regenerated eight version-induced lockfiles, including the new portal example; only project dependency versions changed.
• This exact source packed a fresh four-package 0.17.0 candidate once with API/package validation and source-bound metadata. Exact roster, required .fsi entries including AreaRuntime.fsi, Core's FSharp.Core-only dependency boundary, adapter engine pin/no rendering dependency and the independent Journey consumer all passed.
• A fresh copied package-only consumer proved exactly adapter/Core/Box2D.NET/FSharp.Core and ran both scenes on .NET 10.0.12 / Arch Linux / X64. The 240-tick falling scene reported final height 0.39992859959602356 m, maximum joint error 0.00008517808537522598 m, sensor enter/exit and floor contact. The five-tick portal scene retained one live traveller, one committed traversal, one step per local world, destination position (9.899999618530273, 5.150000095367432) and transformed velocity (-1, 4). Both fresh-world replay comparisons passed.

Original fresh candidate artifacts bind 5589dc7213077faa3b9e5c22dc2ae55415abef16; the earlier 2eaca027 candidate is preserved independently and does not qualify the expanded area-transfer API. This PR prepares release source. Native checks, release selection, collision/trust admission, both-feed publication/readback and public installed execution remain separate. Product/template opt-in remains a subsequent selected follow-up.