VX Provider Updater

Update existing VX providers to RFC 0018 + RFC 0019 standards with layout configuration and system package manager integration.

When to Use

Updating existing provider.toml to add layout configuration
Migrating from custom post_extract hooks to RFC 0019
Migrating from Rust runtime.rs to Starlark provider.star
Adding MSI install support for Windows using Starlark
Adding system package manager fallback for tools without portable binaries
Adding missing license field to provider.toml (all providers MUST have it)
Standardizing provider manifests
Fixing download/installation issues
Fixing "No download URL" or "Executable not found" errors
Batch updating multiple providers