Remove tangled and xrpc-auth dependencies from monopam
The tangled auth was only used to validate handles before init, but
this is redundant since we already validate handles against the
registry. The registry lookup provides sufficient validation.
Removes:
- tangled and xrpc-auth library dependencies
- validate_handle function that required tangled login
- Not_authenticated and Handle_not_found error variants
- ~sw and ~env parameters from Verse.init
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>