Fix ExtendedJumpArray eltype assertion on 32-bit Julia

[ChrisRackauckas-Claude]

Summary

• x86 InterfaceI fails eltype(result.jump_u) == Int64 (actual Int32)
• Assert against native Int

Test plan

• InterfaceI x86 green
• Existing InterfaceI x64 green

Made with Cursor

[ChrisRackauckas-Claude]

x86 InterfaceI still fails after the PriorityTimeTable Int fix with:

InexactError: Int32(...) in DiffEqBase.check_event_occurence → range(..., length=callback.interp_points) / Base._linspace on i686.

Fix is in OrdinaryDiffEq (DiffEqBase lives at lib/DiffEqBase): SciML/OrdinaryDiffEq.jl#4487

Once that DiffEqBase is released, this PR's remaining x86 failure should clear (or we can temporarily [sources] it for a retest).

[ChrisRackauckas-Claude]

x86 still fails on DiffEqBase check_event_occurrence → _linspace(..., len::Int32) (InexactError: Int32(...)).

This branch temporarily [sources] DiffEqBase from SciML/OrdinaryDiffEq.jl#4487 (Int64(callback.interp_points)) so CI can validate the Jump-side fixes. Drop the [sources] block once DiffEqBase with that fix is registered.

[ChrisRackauckas-Claude]

Dropped the temporary DiffEqBase [sources] pin: on Julia 1.10, SciML's develop_sources helper calls Pkg.develop, which rejects rev (consider using add instead). Fix is in SciML/.github#136 (Pkg.add for URL sources). Jump-local Int fixes remain here; VR-callback x86 still needs OrdinaryDiffEq#4487 / a DiffEqBase release.

[ChrisRackauckas-Claude]

x86 InexactError: Int32(...) in check_event_occurrence is the DiffEqBase interp_points/range issue fixed in SciML/OrdinaryDiffEq#4487.

DiffEqBase v7.21.0 registration is open: JuliaRegistries/General#167661. Once that merges and propagates, this PR's x86 lane should pass without temporary [sources] (previously dropped because LTS develop_sources broke).

Will re-run CI after registry merge.