docs: update README and vim help documentation

chore: adds installation instructions with vim.pack

chore: updates README.md

chore: format

fix(commands): fixes issue where commands would block neovim main thread

chore: adds worktrunk config

Squash commits from refactor/commands-echo

feat(skills): add Neovim best practices skills

chore: adds ROADMAP.md

chore: update README.md

chore: adds license

chore: updates AGENTS.md

chore: removes initial plan

chore: fix Makefile and test helpers

refactor(ui): improve notification and picker handling