Executable args CLI parsing format

[jahvon]

Enhancement Summary

Current Behavior

flow install tool dryrun=true name=dev pos1

Proposed Behavior

flow install tool -- --dryrun --name=dev pos1

Changes

• Add -- separator before executable arguments
• Use standard --flag and --flag=value syntax
• Boolean flags can omit values (e.g., --dryrun implies true)
• Positional arguments remain unchanged

Motivation

• Aligns with POSIX standards and common CLI tools
• Clearer separation between flow args and executable args
• Better shell completion support

This will be a breaking change

Additional context

No response