Fix fork: prompt for push URL, fix split_commit display truncation
- Prompt for remote push URL if not provided on command line
(skipped with --yes or --dry-run)
- Fix pp_fork_result to only truncate git SHA hashes (40 hex chars),
not descriptive strings like "(fresh package)"
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>