Feat: documentation

docs/getting-started/saving.md

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+# Saving & Loading
+
+Press `s` to save a project or `l` to load one. These keys work from any view. Both open a file browser where you navigate your filesystem, pick a location, and confirm.
+
+## The File Browser
+
+The browser shows a path input at the top and a directory listing below. Hidden files are filtered out.
+
+- `Up` / `Down` — Browse entries
+- `Right` — Enter a directory
+- `Left` — Go up to the parent directory
+- `Tab` — Autocomplete the current path
+- `Enter` — Confirm selection
+- `Esc` — Cancel
+
+You can also type directly into the path input. Characters are appended to the current path, and the listing updates as you type. Press `Backspace` to delete.
+
+## Saving
+
+When saving, type a filename and press `Enter`. Parent directories are created automatically if they don't exist. Projects are stored as `.cagire` files.
+
+## Loading
+
+When loading, browse to a `.cagire` file and press `Enter`. The project replaces the current session entirely.
+
+## Keybindings
+
+| Key | Action |
+|-----|--------|
+| `s` | Save (from any view) |
+| `l` | Load (from any view) |
+| `Up` / `Down` | Browse entries |
+| `Right` | Enter directory |
+| `Left` | Parent directory |
+| `Tab` | Autocomplete path |
+| `Enter` | Confirm |
+| `Esc` | Cancel |