docs: create UNIFIED.md roadmap and workflow guide

UNIFIED.md

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+# 🌌 Grand Unified Neovim (4rc0s/my-kickstart)
+
+This is the unified Neovim configuration for all my machines, based on the Neovim 0.12+ native `vim.pack` system.
+
+## 🚀 Native Package Workflow (0.12+)
+Since we moved from Lazy to `vim.pack`, the workflow is buffer-centric:
+1. `<leader>ps`: **Sync** (Fetch updates from Git).
+2. `w`: **Apply** (Inside the update buffer, write to disk/install).
+3. `q`: **Quit** the update buffer.
+4. `<leader>pi`: **Inspect** (Check current offline status).
+
+## 💻 Machine Detection
+We use `vim.uv.os_gethostname()` in `init.lua` to toggle settings.
+Current machines:
+- **vera**: (Primary Linux workstation) - High-res font, full LSP suite.
+
+## 🗺️ The Grand Unified Roadmap
+- [x] Migrate to Neovim 0.12 `vim.pack`.
+- [x] Set up personal fork and unified remote (`origin`).
+- [x] Implement ergonomic keymaps for native package management.
+- [ ] Merge legacy plugins from other machine forks.
+- [ ] Add machine-specific UI toggles for terminal vs. GUI Neovim.
+- [ ] Centralize snippet collections.
+
+## 🛠️ Git Maintenance
+- **Upstream:** `https://github.com/nvim-lua/kickstart.nvim`
+- **Origin:** `https://github.com/4rc0s/my-kickstart`
+- **Syncing:** `git fetch upstream && git merge upstream/master`