[cross-repo] Publish FS.GG.Game.Harness — landed after 0.5.1, on no feed; blocks Rendering#927/#923 (epic #1190 WI-6)

[EHotwagner]

From: FS.GG.Rendering, found while working FS-GG/FS.GG.Rendering#927. Epic FS-GG/.github#1190 (WI-6 chain). Contract axis: $(FsGgGameVersion).

The gap

FS.GG.Game.Harness is a packable project in this repo (src/Game.Harness/FS.GG.Game.Harness.fsproj: IsPackable=true, PackageId=FS.GG.Game.Harness, in FS.GG.Game.slnx) but it exists on no feed. nuget.org's FS.GG.Game.* axis at 0.5.1 publishes only FS.GG.Game.Core and FS.GG.Game.Render; there is no FS.GG.Game.Harness package at 0.5.0, 0.5.1, or anywhere (api.nuget.org/v3-flatcontainer/fs.gg.game.harness/index.json → BlobNotFound).

Why

The Harness project + .fsi surface landed after the last release:

• v0.5.1 released 2026-07-18 20:48Z (commit 20da2673, "patch — Geometry.fsi doc fix").
• src/Game.Harness/FS.GG.Game.Harness.fsproj added 2026-07-19 06:33Z (feat(game-harness): FS.GG.Game.Harness deterministic headless driver (#420) #423), ~10h later.
• fs-gg-playtest skill added 2026-07-19 06:57Z (docs(fs-gg-playtest): product skill for headless gameplay evidence (#421) #424).
• No release has been cut since, so the latest published version predates the Harness project.

WI-1 (#420) and WI-2 (#421) are closed, but the package the epic depends on was never published — the release that would carry it hasn't run.

The ask

Cut a FS.GG.Game release that publishes FS.GG.Game.Harness as part of the coherent set, so downstream can consume it.

Two things to confirm while doing so:

1. release.yml has a now-stale assumption. Its pack step comments "Only FS.GG.Game.Core + FS.GG.Game.Render are IsPackable=true ... so packing the whole slnx yields exactly those two packages". After feat(game-harness): FS.GG.Game.Harness deterministic headless driver (#420) #423 the slnx has three packable projects, so dotnet pack FS.GG.Game.slnx will now emit Harness too (good — but the comment should be corrected, and the coherent-version story confirmed for a third package: Harness → depends on Game.Core@same-version, BCL only).
2. The nupkg must carry api-surface/*.fsi (the #782 convention). FS.GG.Rendering's scripts/refresh-api-surface-mirror.fsx restores the pinned package and hard-errors if it "carries no api-surface/ — it predates #782." Game.Core/Render already pack theirs (Rendering mirrors them today); Harness is in the same slnx under the same repo-wide packing target, so it should inherit it — please confirm on the packed Harness nupkg.

Downstream blocked by this

• Pin FS.GG.Game.Harness + bundle its api-surface in the game scaffold (prereq for #923 fs-gg-playtest) FS.GG.Rendering#927 — pin + bundle Harness api-surface in the game scaffold. Cannot start: pinning a non-existent package is NU1101, and the mirror generator hard-errors on the failed restore.
• Add fs-gg-playtest to the game profile skill union (WI-6) FS.GG.Rendering#923 (WI-6) — add fs-gg-playtest to the game profile skill union; its frozen mirror does open FS.GG.Game.Harness and cites docs/api-surface/Game.Harness/, which #927 must first make real.

Paths: .github/workflows/release.yml Directory.Build.local.props src/Game.Harness/README.md tests/Game.Harness.Tests/packages.lock.json tests/Game.Render.Tests/packages.lock.json