clean up legacy files

MIGRATION_PLAN.md

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+# Neovim Migration Checklist
+
+Source of truth for the step-by-step rebuild. Keep this concise and up to date. See details in `neovim-migration-guide.md`.
+
+## Phase 0 — Ground Rules
+- [x] Create AGENTS.md with rules
+  
+## Phase 1 — Clean & Archive Legacy Config
+- [ ] Confirm scope and priorities for this phase
+- [ ] Inventory existing Vimscript, plugin files, and directories
+- [ ] Create `legacy/` archive folder within this config
+- [ ] Move legacy init files and plugin directories into `legacy/` (do not delete)
+- [ ] Optionally add `legacy/README.md` noting what was archived
+- [ ] Keep `undodir`, `spell`, `view`, `UltiSnips`, `templates` as-is for now (review later)
+
+## Phase 2 — Bootstrap
+- [ ] Confirm scope and priorities for this phase
+- [ ] Scaffold Lua config skeleton (`init.lua`, `lua/settings.lua`, `lua/keymaps.lua`, `lua/autocmds.lua`, `lua/utils.lua`, `lua/plugins/`)
+- [ ] Bootstrap `lazy.nvim` plugin manager
+- [ ] Disable unused providers (ruby, perl, node)
+
+## Phase 3 — Core Editing & LSP
+- [ ] Confirm scope and priorities for this phase
+- [ ] Port non-plugin settings to Lua (options, listchars, showbreak, spelllang=en_gb)
+- [ ] Add core completion stack: `nvim-cmp`, `cmp-nvim-lsp`, `cmp-buffer`, `cmp-path`, `LuaSnip`
+- [ ] Add `nvim-lspconfig` with minimal defaults (no over-configuration)
+
+## Phase 4 — Navigation
+- [ ] Confirm scope and priorities for this phase
+- [ ] Add `neo-tree.nvim` with per-tab roots, sidebar toggle, floating view, and preview keymap (no buffer pollution)
+- [ ] Add `telescope.nvim` (+ optional `telescope-fzf-native.nvim`) and basic pickers
+
+## Phase 5 — Treesitter
+- [ ] Confirm scope and priorities for this phase
+- [ ] Add `nvim-treesitter` with incremental selection, highlighting
+- [ ] Add `nvim-treesitter-textobjects`
+- [ ] Add `nvim-ts-autotag`
+
+## Phase 6 — UX / Editing
+- [ ] Confirm scope and priorities for this phase
+- [ ] Add `numToStr/Comment.nvim`
+- [ ] Add `kylechui/nvim-surround`
+- [ ] Add `windwp/nvim-autopairs`
+- [ ] Add `lukas-reineke/indent-blankline.nvim`
+- [ ] Add `ggandor/leap.nvim` or `folke/flash.nvim`
+- [ ] Add `kevinhwang91/nvim-ufo` for folding
+- [ ] (Optional) Add `mbbill/undotree`
+
+## Phase 7 — Git, Markdown, Copilot, Formatting
+- [ ] Confirm scope and priorities for this phase
+- [ ] Add `lewis6991/gitsigns.nvim`
+- [ ] Add `render-markdown.nvim`
+- [ ] Add `zbirenbaum/copilot.lua` + `copilot-cmp`
+- [ ] Add `nvimtools/none-ls.nvim` with minimal formatters/linters
+
+## Phase 8 — Migrate Kept Behaviours
+- [ ] Confirm scope and priorities for this phase
+- [ ] Abbreviations: `adn→and`, `waht→what`, `tehn→then`, `functin→function`, `positin→position`
+- [ ] Templates: auto-populate new `.sh` from template
+- [ ] Whitespace highlighting (modern approach)
+- [ ] Persistent folds (via UFO)
+
+## Phase 9 — Cleanup & Validation
+- [ ] Confirm scope and priorities for this phase
+- [ ] Retire legacy Vimscript files (keep for reference until verified)
+- [ ] Validate startup performance (no errors, fast launch)
+- [ ] Validate tab-per-context workflow with Neo-tree
+- [ ] Validate Telescope navigation + LSP jumps
+- [ ] Validate HTML/PHP/JS/Markdown tooling
+
+---
+
+Notes:
+- Keep plugin specs minimal; configure in their own `lua/plugins/*.lua` files.
+- Avoid adding plugins not listed in the guide unless explicitly requested.
+- Prefer simple defaults; only add settings that clearly improve workflow.