feat: add counted word change actions

Add cw/cb and configurable core actions using the same line-local spans as dw/db. Enter Insert with grouped replacement undo and native dot repeat.

docs/configuration.md

@@ -156,7 +156,7 @@ The built-in `gt`/`gb` sequences move to the first/last line in Normal and Visua
 
 With a decimal prefix, `g` instead jumps immediately to that one-based source line: `42g` goes to line 42, clamped at EOF, at first nonblank. Normal moves all carets; Visual extends selections. In diff text panes, explicit line jumps reveal folded source lines rather than counting only displayed excerpts. `g` without a count still begins `gt`, `gb`, or `gf`; a count followed by `g` is complete and does not await a suffix. Rebind the Normal/Visual native action `config.core.go_to_line` to use the numeric prefix with another key. Existing `g` bindings and prefixes override this default route.
 
-Normal `yy` copies complete rows without moving the carets; `dd` / `cc` delete/change complete rows; `dw` / `db` delete forward/backward word spans within each caret's current logical line, preserving newlines. Leading and post-operator counts multiply and word deletions stop at the line end/start. Bind `config.core.copy_line`, `config.core.delete_line`, `config.core.change_line`, `config.core.delete_word_forward`, or `config.core.delete_word_backward` to another key or sequence for another route. A configured/disabled operator key, a configured sequence starting with that key, or choosing it as the leader overrides its built-in operator prefix. These are dedicated actions, not general operator–motion grammar.
+Normal `yy` copies complete rows without moving the carets; `dd` / `cc` delete/change complete rows; `dw` / `db` delete forward/backward word spans within each caret's current logical line, preserving newlines. `cw` / `cb` cut the same spans and enter Insert. Leading and post-operator counts multiply and word edits stop at the line end/start. Bind `config.core.copy_line`, `config.core.delete_line`, `config.core.change_line`, `config.core.delete_word_forward`, `config.core.delete_word_backward`, `config.core.change_word_forward`, or `config.core.change_word_backward` to another key or sequence for another route. A configured/disabled operator key, a configured sequence starting with that key, or choosing it as the leader overrides its built-in operator prefix. These are dedicated actions, not general operator–motion grammar.
 
 Normal `C` / `D` / `Y` change/delete/copy the cursor-to-line-end suffix through `config.core.change_to_line_end`, `config.core.delete_to_line_end`, and `config.core.copy_to_line_end`. Normal `r` waits for a literal replacement character through `config.core.replace_character`; `s` deletes the current grapheme and enters Insert through `config.core.substitute_character`. Rebinding these actions preserves their native counts, Unicode boundaries, undo, and read-only guards.
 
@@ -170,7 +170,7 @@ Normal `C` / `D` / `Y` change/delete/copy the cursor-to-line-end suffix through
 | Normal, Visual | `insert_first_nonblank`, `append_line_end`, `clone_above`, `clone_below` |
 | Normal | `join_lines`, `undo`, `redo`, `command` |
 | Normal | `copy_line`, `delete_line`, `change_line` |
-| Normal | `change_to_line_end`, `delete_to_line_end`, `copy_to_line_end`, `replace_character`, `substitute_character`, `delete_word_forward`, `delete_word_backward` |
+| Normal | `change_to_line_end`, `delete_to_line_end`, `copy_to_line_end`, `replace_character`, `substitute_character`, `delete_word_forward`, `delete_word_backward`, `change_word_forward`, `change_word_backward` |
 | Normal | `save`, `force_save`, `quit`, `force_quit`, `restart`, `force_restart`, `save_and_quit`, `force_save_and_quit`, `plugins` |
 | Normal | `edit`, `buffers`, `buffer`, `buffer_next`, `buffer_previous`, `buffer_delete`, `buffer_force_delete` |
 | Normal | `follow_link` |