### Fixed
- Restored `tools/legacy/` build scripts lost from repository
- Fixed `UnicodeEncodeError` on CI: replaced Unicode checkmarks with ASCII OK/FAIL in build summary
- Fixed MSB8020 toolset error on GitHub Actions: `build_plugin_2600_vs2026.py` now detects the installed VS toolset dynamically (falls back to v143 on VS2022 runners)
- Build script for 26.00 selects `Nsis7z_vs2026.vcxproj` (v145) or `Nsis7z.vcxproj` (v143) based on detected toolset

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