refactor(sterni/blërg): make caller of Run responsible for stderr

We can use ! in R to display the error instead.

Change-Id: Ib7f6e559014e3f99a9f99c159a31a45a7a0e65a5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/13105
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

users/sterni/blërg/blërg.bqn

@@ -28,11 +28,10 @@ Run ← {
   𝕊 𝕩: 1 𝕊 𝕩;
   doChomp 𝕊 cmd:
   exit‿stdout‿stderr ← •SH cmd
-  •term.ErrRaw⍟(0≠exit) stderr
-  ⟨Chomp⍟doChomp stdout, exit⟩
+  exit∾Chomp⍟doChomp¨ stdout‿stderr
 }
 
-R ← {𝕊 stdout‿exit: !0=exit ⋄ stdout}∘Run
+R ← {𝕊 exit‿stdout‿stderr: stderr!0=exit ⋄ stdout}∘Run
 LR ← Lines∘R
 
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