Implements the UniGetUI package broker protocol:
- Policy evaluation engine matching the spec in UniGetUI policies/
- WinGet command-line builder from validated request fields
- HTTP/1.1 server over named pipe transport (Windows)
- Dry-run executor for testing, real executor for production
- Standalone test binary for development without the full agent service
The broker validates requests against admin-authored policies before
constructing elevated package manager commands. It never executes
client-supplied command text directly.
Supported: WinGet install/update/uninstall operations.
Other managers return 'not supported' for now.
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