docs: add README, install, commands, and troubleshooting documentation
README.md: project overview, quick start, command table, install/uninstall summary.
docs/install.md: prerequisites, install/uninstall procedures, install location, PATH behavior, status-line setup.
docs/commands.md: all 9 commands with syntax, flags, examples, query resolution, env vars, exit codes.
docs/troubleshooting.md: practical fixes for PATH, status line, doctor failures, delete protection, file locations.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
typebasedio
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