Created bd-198: Add label management commands to CLI - Add bd label add/remove/list subcommands - Extend bd list with --label filter - Enable organizing issues into streams/categories - Support parallel workflow coordination Closes mistakenly created GitHub issue #39 (should use beads itself). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>