feat: add counted forward and backward character seek motions

docs/configuration.md

@@ -68,6 +68,8 @@ The built-in `gt`/`gb` sequences move to the first/last line in Normal and Visua
 
 Normal `dd` and `cc` delete/change complete rows, with leading counts. Bind `config.core.delete_line` or `config.core.change_line` to a single key or leader sequence for another route. A configured/disabled `d` or `c`, or choosing that key as the leader, overrides its built-in doubled sequence. These are dedicated line actions, not general operator–motion grammar.
 
+`f<char>` / `F<char>` seeks forward/backward on the current line in Normal and Visual, with counts such as `2fx`. Rebind `config.core.seek_forward` / `config.core.seek_backward` to a single key or leader sequence; the action then waits for a literal target character. For example, `config.bind "s", config.core.seek_forward` makes `2sx` seek the second following `x`. Pass `mode: config.modes.visual` to install a Visual route. These native-only actions do not have Ex commands.
+
 ## Action reference
 
 | Available modes | Methods on `config.core` |
@@ -90,6 +92,7 @@ Normal `dd` and `cc` delete/change complete rows, with leading counts. Bind `con
 | Normal, Visual | `repeat_last_edit` |
 | Normal, Visual | `file_picker`, `file_explorer` |
 | Normal, Visual | `document_start`, `document_end` |
+| Normal, Visual | `seek_forward`, `seek_backward` |
 | Normal, Insert, Visual | `line_start`, `line_end` |
 | Normal, Insert, Visual, Tree | `left`, `right` |
 | Normal, Insert, Visual, Selection, Tree | `down`, `up` |