Neovim local plugins

This config ships small in-repo Lua plugins. Loaders live in exact_plugins_local/; heavier implementations live in exact_plugins_local_src/.

Slice	Owns
Testing and commit AI	Jest split runner and Conventional Commit summarizer
Ownership, refactors, and tmux	CODEOWNERS lookup/search, TypeScript export moves, send-to-right-pane bridge
Navigation and quickfix	source/test toggle, copy-to-quickfix dirs, quickfix cleanup
Screenshots and window ergonomics	freeze, fit-to-content width toggle, winbar path display

For the rest of the Neovim setup, start at Editor: Neovim.