feat: follow Markdown file links and heading fragments

docs/configuration.md

@@ -55,6 +55,8 @@ Key notation follows [Herdr's readable style](https://herdr.dev/docs/configurati
 
 `ctrl+i` aliases `tab`, and `ctrl+m` aliases `enter`, including inside leader sequences. Ctrl+h and Ctrl+j are distinct control keys, not Backspace/Enter aliases. Only a single modifier on an ASCII letter is supported. Arbitrary non-leader key sequences, Alt/Cmd/Super, combined modifiers, modified special keys, and Vim-style angle-bracket notation are rejected rather than silently treated as another key.
 
+The built-in Normal `gf` sequence follows Markdown file links. It is not a configurable general sequence prefix: bind `config.core.follow_link` to a single key or leader sequence to add another route. A configured or disabled Normal `g`, or choosing `g` as the leader, overrides the built-in prefix.
+
 ## Action reference
 
 | Available modes | Methods on `config.core` |
@@ -62,6 +64,7 @@ Key notation follows [Herdr's readable style](https://herdr.dev/docs/configurati
 | Normal | `insert`, `append`, `open_below`, `open_above` |
 | Normal, Visual | `insert_first_nonblank`, `append_line_end`, `clone_above`, `clone_below` |
 | Normal | `join_lines`, `undo`, `redo`, `command` |
+| Normal | `follow_link` |
 | Normal | `lsp.definition`, `lsp.diagnostics`, `lsp.hover` |
 | Normal | `search`, `paste_before`, `paste_after` |
 | Normal | `paste_system_before`, `paste_system_after` |