clean up legacy files

AGENTS.md

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+# AGENTS: Neovim Config Migration
+
+Scope: applies to the entire `~/.config/nvim` directory tree.
+
+This repository is being migrated to a modern, minimal Neovim setup driven by Lua and lazy.nvim. Follow these rules when making changes.
+
+## Goals
+- Modern Lua-first config; avoid Vimscript unless explicitly requested.
+- Keep it minimal, fast, and maintainable.
+- Base plugin management on `lazy.nvim` with modular plugin specs.
+- Support tab-per-context workflow with Neo-tree per tab, Telescope navigation, LSP, Treesitter, Copilot, and sane UX defaults.
+
+## Do Not Reintroduce
+- Custom Vimscript tabline/statusline, foldtext, UI hacks.
+- Legacy autocommands toggling cursorline/column per window.
+- CoC or CoC-specific config.
+- netrw settings (Neo-tree will be used).
+- Providers for ruby/perl/node (disable unless required by a plugin).
+- Auto-reload vimrc-on-write templates.
+- `cursorcolumn` and old folding logic not related to UFO.
+
+## Repository Structure (target)
+```
+~/.config/nvim/
+├── init.lua                   -- entrypoint; bootstraps lazy.nvim and loads Lua modules
+└── lua/
+    ├── settings.lua          -- non-plugin options
+    ├── keymaps.lua           -- non-plugin keymaps
+    ├── autocmds.lua          -- non-plugin autocommands
+    ├── utils.lua             -- helpers (only if needed)
+    └── plugins/              -- one file per plugin or domain
+        ├── neo-tree.lua
+        ├── telescope.lua
+        ├── treesitter.lua
+        ├── cmp.lua
+        ├── lsp.lua
+        ├── copilot.lua
+        ├── ufo.lua
+        ├── gitsigns.lua
+        ├── markdown.lua
+        └── none-ls.lua
+```
+
+## Coding Conventions
+- Use Lua APIs: `vim.opt`, `vim.api.nvim_create_autocmd`, `vim.keymap.set`.
+- No inline Vimscript or `vim.cmd` blocks unless strictly necessary.
+- Keep plugin configuration self-contained in its plugin spec file.
+- Prefer small, readable modules and minimal configuration over heavy customization.
+- Keymaps: use `vim.keymap.set` with `{ silent = true, noremap = true }` defaults unless otherwise required.
+- Autocommands: group via `vim.api.nvim_create_augroup` and create specific, narrowly scoped autocmds.
+- Avoid global state; return tables from modules and plugin specs.
+
+## Plugin Management (lazy.nvim)
+- Each plugin lives in `lua/plugins/<name>.lua` and returns a spec table.
+- Use `opts = {}` for default options and `config = function(_, opts) ... end` for setup.
+- Only include plugins listed in the migration guide unless explicitly approved.
+
+## Required Plugin Categories
+- Core: `nvim-lspconfig`, `nvim-cmp`, `cmp-nvim-lsp`, `cmp-buffer`, `cmp-path`, `LuaSnip`.
+- Navigation: `neo-tree.nvim`, `telescope.nvim` (+ optional `telescope-fzf-native.nvim`).
+- Treesitter: `nvim-treesitter`, `nvim-treesitter-textobjects`, `nvim-ts-autotag`.
+- UX/Editing: `Comment.nvim`, `surround.nvim`, `nvim-autopairs`, `indent-blankline.nvim`, `leap.nvim` or `flash.nvim`, `nvim-ufo`, `undotree` (optional).
+- Git: `gitsigns.nvim`.
+- Markdown: `render-markdown.nvim`.
+- Copilot: `copilot.lua`, `copilot-cmp`.
+- Formatting: `none-ls.nvim`.
+
+## Workflow Requirements to Preserve
+- Tab-per-context: each tab has its own Neo-tree root.
+- Provide keymaps for: Neo-tree floating, Neo-tree sidebar toggle, and file preview. Previews should not pollute buffer list.
+- Keep splits inside tabs.
+- Use Telescope and LSP for navigation.
+- Heavy HTML/PHP/JS/Markdown usage (WordPress plugin dev) — prioritize these languages in LSP/Treesitter.
+
+## Behaviours to Keep (modernized)
+- Abbreviations: `adn→and`, `waht→what`, `tehn→then`, `functin→function`, `positin→position`.
+- Templates: auto-populate `.sh` from template.
+- Whitespace highlighting (use modern alternatives, e.g., `listchars`, plugins if needed).
+- Persistent folds (prefer `nvim-ufo`).
+- Spell & text: `spelllang=en_gb`, custom `listchars`, `showbreak`.
+
+## Migration Notes
+- Do not edit legacy Vimscript files except to extract settings to Lua. Keep them intact until migration completes.
+- Introduce `init.lua` and bootstrap `lazy.nvim` before adding plugins.
+- Disable unnecessary providers early: `vim.g.loaded_ruby_provider = 0`, etc.
+- Keep startup fast; avoid unnecessary autoloading or heavy defaults.
+- When cleaning, archive existing files into a `legacy/` folder within this config instead of deleting. Maintain a brief index if helpful.
+
+## Validation
+- Ensure Neovim starts without errors and with minimal startup time.
+- Verify tab workflow, Neo-tree behaviour, Telescope, LSP basics, and completion.
+- Keep plugin count tight; remove anything unused.
+
+## Process
+- Before large changes, update the task plan via the CLI `update_plan` tool.
+- Keep the live checklist in `MIGRATION_PLAN.md:1` up to date and in sync with changes.
+- At the start of each phase, confirm scope and priorities for that phase.
+- Keep PR-sized patches; avoid broad unrelated edits.
+- Document non-obvious choices in commit messages or short comments near the code that needs it.