[lucabol]

Summary

• publish independent Full, LLVM, Cranelift, and C MSI families on Windows
• install isolated profile payloads with qualified commands and a reference-counted shared selector/PATH entry
• preserve legacy LLVM MSI migration and fail closed on archive/MSI command collisions
• build, coextract, smoke, checksum, and publish all four MSIs in the release workflow

Validation

• 317 offline release, packaging, workflow, and installer tests
• real WiX builds for all four profiles
• combined administrative extraction with all qualified commands and shared selector
• unique ProductCode/UpgradeCode checks and shared component identity checks