[GhzGarage]

MantleCore half of the build-warnings pass. mantle side: mantleplatform/mantle#320. This merges first.

Mantle-PR: mantleplatform/mantle#320

Changes

• MantleVehicleBodySplit: uses UStaticMesh::SetAutoComputeLODScreenSize(false) in place of the deprecated bAutoComputeLODScreenSize member (C4996).
• MantleWeaponFitTest: the point vectors start at zero where they're declared (C4701).
• MantlePublishMemoryTest: two tests remove files on purpose (SpillVanish deletes 3; the queue-file case names a gone.bin it never writes). They now declare the engine's Failed to read file warnings as expected (3 and 1), so the test log stops showing them as noise.
• Copies from mantle #320 at 658da9acd, synced with check_copies.py --sync from a git archive of that commit; all 457 copied files match their home:
  • LuauLib: Luau 0.738 → 0.746, plus LuauWarnings.h.
  • QuickJSLib: quickjs-ng v0.16.2 → v0.18.0, with the Mantle patches 0001/0002 regenerated.
  • MantleScriptTools: the QuickJS interrupt handler takes a JSContext.
  • Resources/ScriptApi: typings at API 1.89.
• Build.cs, by hand (not copied): LuauLib.Build.cs force-includes LuauWarnings.h and defines _CRT_SECURE_NO_WARNINGS, the same as mantle's MantleGameLuauLib.Build.cs. The reason for each warning is in that header. QuickJSLib.Build.cs only gets its version comment, because 0.18.0 builds clean.

Not in this PR

The ~90 package was marked as deleted in editor, but has been modified on disk lines (AssetRegistry, from weapon builder, rigid-mesh and asset-cleanup tests) are still there.

• Cause, from the engine: AssetRegistry.cpp:8501. AssetDeleted marks the package empty, and then the directory-watcher change from the save just before arrives and trips the warning.
• What I tried: ticking the directory watcher before the cleanup's delete. It didn't help: 92 lines remained, because the save's OS notification hasn't arrived yet when the delete runs in the same frame. So I took it out. It needs a different fix.

Testing

Run with D:\Mantle\mantle at 658da9acd plus this branch, headless with -nullrhi:

• Build: MantleEditor Win64 Development succeeded with 0 warnings across both repos. Luau, QuickJS and the MantleEditor files all recompiled.
• Tests, first run: 290/290 passed. It covered:
  • Mantle.Script.* (including ScriptTools, ScriptCatalog, ScriptPackages and ScriptPoint; Mantle.Script.Api.ManifestCopiesAreCurrent passes)
  • AssetCleanup, PublishMemory, WeaponBuilderV2, WeaponBuilderExport, WeaponRigidMesh, WeaponFit and WeaponPublish.Parts
  • Vehicle BodySplit/BodyJoin/LODs
  • Weapon.Melee SpearGuardDeathWorld and SpearSavedGuardDeathWorld
  • Chat.Relay, Mantle.Animation.* and Grab.Component
• Rerun after the final edits: 40/40 passed (PublishMemory, AssetCleanup, WeaponFit, Vehicle BodySplit/LODs, ManifestCopiesAreCurrent), with 0 Failed to read file warnings and 0 build warnings.

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