ci: sandbox verification — all CI workflows (Revit_Toolkit)

[sakanni]

Purpose

Sandbox end-to-end CI verification PR — Revit_Toolkit specifically exercises the build alt-config path (Release2022–Release2026 in altConfigs.txt) and the Revit-year-versioned DLL loading pattern in SerialiserRunner.

Expected workflow coverage

Workflow	Expected outcome
Build	Pass — primary Release build + 5 Revit alt configs (Release2022-2026) via build-alt-configs.ps1
Format	Pass or flag pre-existing format issues
Unit Tests	Skip gracefully — no .ci/unit-tests/ with .sln
Copyright Compliance	Pass or flag pre-existing issues
Code Compliance	Pass or flag pre-existing issues
Documentation Compliance	Pass or flag pre-existing issues
Project Compliance	Pass or flag pre-existing issues
Dataset Compliance	Skip gracefully — no Datasets/ directory
Dataset Unit Tests	Skip gracefully — no .ci/Datasets/
Versioning	Pass (Revit types in BHoM Versioning_Toolkit scope)
Serialisation	Pass — IsLoadableAssembly pattern handles Revit_Toolkit20XX.dll naming

Do NOT merge — sandbox verification only.