Version bump to 1.13.0

[ChrisRackauckas-Claude]

Version Bump

Bumping version from 1.12.0 to 1.13.0 to prepare for release.

Changes since last release (v1.12.0, 2025-12-16)

This release includes 14 commits with the following improvements:

Infrastructure & Tooling

• Switch from JuliaFormatter to Runic.jl for code formatting (Switch from JuliaFormatter to Runic.jl for code formatting #579)
• Bump GitHub Actions checkout from v4 to v6 (Bump actions/checkout from 4 to 6 #580)
• Add PrecompileTools workload to improve TTFX (Add PrecompileTools workload to improve TTFX #577)

Documentation

• Add documentation for using real data with time-varying controls (Add documentation for using real data with time-varying controls #576)
• Fix documentation grammar and clarity issues (Documentation improvements: fix grammar and clarity issues #575)
• Fix broken links, typos, and placeholder text in documentation (Documentation improvements: fix broken links, typos, and placeholder text #574)

Dependencies

• CompatHelper: bump compat for ModelingToolkit to 11 for package docs (CompatHelper: bump compat for ModelingToolkit to 11 for package docs, (keep existing compat) #573)

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