When -m flag is not provided, opens $EDITOR to compose the reply.
The editor shows a template with the original message for context.
Comment lines (starting with #) are filtered out.
- Makes -m flag optional instead of required
- Falls back to vim/vi/nano/emacs if $EDITOR not set
- Updates help text to document editor mode (gt-d46.5)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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