Added a new run command that executes configured commands stored in assist.yml. You can define named commands with optional default arguments, then invoke them with assist run <name>. Any extra arguments passed get appended to the configured ones. There’s also assist run add to quickly register new configurations without editing the YAML manually.

The config loader now checks .claude/assist.yml first before falling back to assist.yml in the project root, allowing the configuration to live alongside other Claude-related settings.

Fixed an issue where run add would mangle arguments containing colons or other special characters due to Commander’s argument parsing. The fix bypasses Commander and parses process.argv directly to preserve the original argument values.