`cook doctor` fails to report issue that playground errors on

[jwodder]

If I have a .cook file with a non-numeric timer like:

Cook for ~{a few%minutes}.

then cook doctor will not report any problems when validating the recipe, but the playground reports an error:

Error: Timer value is text: a few
  ╭─[playground]
  │
1 │ Cook for ~{a few%minutes}.
  ┆            ──┬──          
  ┆              │            
  ┆              ╰───────────── expected a number here
──╯

[dubadub]

The problem here is that these errors come from extensions which aren't enabled in CookCLI