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

docs/ai/index.mdx

@@ -57,5 +57,5 @@ None of these files are role-gated: `.chezmoiignore.tmpl` applies them on every
 ## Shell entry points
 
 - `ai` (fish function) opens a `gum choose` picker over `claude`, `opencode`, `codex`, `hermes`, and `fractal`. Picking `claude` runs `claude --dangerously-skip-permissions`; the others run the binary of the same name. See [fish](/shell/fish).
-- <kbd>Ctrl</kbd> <kbd>A</kbd> opens the `agents` television cable from the fish prompt: every installed agent CLI (omp, claude, codex, opencode, …); <kbd>enter</kbd> starts it ([television](/tools/television#agents)). In zsh it still launches `omp`.
+- <kbd>Ctrl</kbd> <kbd>A</kbd> runs [`omp-session`](/shell/scripts#omp-session) from the fish and zsh prompt: on the default branch it resumes a session written in the last 3 hours, else opens the `omp-sessions` television cable; on any other branch it resumes that branch's newest session or starts a new one. `tv agents` still lists every installed agent CLI ([television](/tools/television#agents)).
 - `launch_omp_livediff_overlay` and `lc-elir` are omp helpers in `~/.local/bin`; see [omp](/ai/omp#shell-integration) and [scripts](/shell/scripts).