docs(docs): update ctrl‑a keybinding docs to use omp‑session and add omp‑session script description

docs/shell/bash-zsh.mdx

@@ -75,7 +75,7 @@ The tv pickers have their own widgets, because `tv --inline` opens on the line b
 | <kbd>ctrl-p</kbd> | `pj-inline` (`pj` cable) |
 | <kbd>ctrl-t</kbd> | tv smart autocomplete (from `tv init zsh`) |
 | <kbd>down</kbd> | `pj-down`: `PJ_QUIET=1 pj` on an empty prompt, otherwise `down-line-or-history` (bound to `^[[B` and `^[OB`) |
-| <kbd>ctrl-a</kbd> | `omp` |
+| <kbd>ctrl-a</kbd> | `omp-session`: resume or start omp for the current repo ([Scripts](/shell/scripts#omp-session)) |
 | <kbd>ctrl-g</kbd> | `lazygit` |
 | <kbd>ctrl-q</kbd> | `exit` |
 | <kbd>ctrl-c</kbd> | At the prompt: kill the buffer, clear the screen and kitty scrollback (`ESC[2J ESC[3J`), reset the prompt |