docs: remove obsolete Claude Code and omp docs, update references

docs/shell/fish.mdx

@@ -186,6 +186,7 @@ The header comment says the file should stay empty, but it holds the following:
 | <kbd>ctrl-o</kbd> | `_gho_bind`: `gho` (pick a ghq repo or Obsidian vault from the `ghq-repos` cable and cd into it), then repaint |
 | <kbd>ctrl-p</kbd> | `_pj_bind`: `pj`, the task runner on the `pj` cable ([Scripts](/shell/scripts#pj)), then repaint |
 | <kbd>ctrl-a</kbd> | `omp-session`, then repaint: resume or start omp for the current repo by branch and session age, opening the `omp-sessions` cable only when nothing qualifies ([Scripts](/shell/scripts#omp-session)) |
+| <kbd>ctrl-n</kbd> | `omp`, then repaint: always a new omp session |
 | <kbd>ctrl-w</kbd> | `atuin ai inline`: natural-language command overlay |
 | <kbd>ctrl-z</kbd> | `_jobs_bind`: with one background job, `fg` it; with several, pick one from the `jobs` cable ([television](/tools/television#jobs)) and `fg` that; with none, nothing. While a job holds the terminal, ctrl-z is still the tty's suspend, so the key toggles suspend and resume |
 | <kbd>ctrl-g</kbd> | `lazygit` |