clean up legacy files

legacy/README.md

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+# Legacy Neovim Config Archive
+
+This folder contains the previous Neovim/Vimscript configuration and related files, archived during Phase 1 of the migration. Nothing here should be modified; use only for reference while rebuilding the new Lua-based setup.
+
+Archived on: 2025-12-06
+
+## Contents archived
+- Directories: `after/`, `autoload/`, `bundle/`, `colors/`, `ftdetect/`, `ftplugin/`, `lua/`, `tmpdir/`, `.vimtmp/`
+- Files: `init.auto-window.vim`, `init.commands.vim`, `init.fold-text.vim`, `init.full.vim`, `init.plugins.vim`, `init.tabline.vim`, `init.vim`, `init.vscode.vim`, `Session.ts.vim`, `Session.vim`, `postcss.config.js`, `.netrwhist`, `.tags`
+
+## Kept in place (not archived)
+- `undodir/`, `spell/`, `view/`, `UltiSnips/`, `templates/`
+- Repo metadata: `.git/`, `.gitignore`
+- Migration docs: `AGENTS.md`, `MIGRATION_PLAN.md`, `neovim-migration-guide.md`
+
+## Notes
+- netrw history (`.netrwhist`) was archived since Neo-tree will replace netrw usage.
+- Colors and Vimscript `after/` settings were archived to avoid runtimepath collisions with the new config.
+- The old `lua/` directory was archived to ensure a clean rebuild of the Lua modules using the new structure and lazy.nvim.