Add a Go-based command_palette kitten that provides a searchable,
interactive overlay for browsing and triggering keyboard shortcuts
and actions.
- New Go kitten at kittens/command_palette/ with FZF fuzzy search,
grouped/flat views, and remote control action triggering
- Python collect_keys_data() does data collection, passed via stdin
- Navigation: arrows, ctrl+j/k (vim), ctrl+n/p (emacs), page up/down
- Enter triggers the selected action via RC command
- Help text displayed in footer for selected binding
- Added Go tests (main_test.go) and Python tests (command_palette.py)
