Raw SQLAlchemy error shown to the user when confirming a sub-stage

[sdhrsd]

What I did

I was running a CARE interview and sent Confirm Stage 3.2 as complete. - the same
thing I'd sent at four earlier sub-stages in that session.

What appeared

⚠️ The agent hit an error before finishing this turn: Method 'commit()' can't be
called here; method '_prepare_impl()' is already in progress and this would cause
an unexpected state change to <SessionTransactionState.CLOSED: 5>
(Background on this error at: https://sqlalche.me/e/20/isce)

An SME shouldn't be shown this

CARE is meant to let a subject-matter expert design an agent without needing to
understand the platform. This message tells that person nothing they can act on -
not whether their work was saved, not whether the step went through, not whether
it's safe to try again.

I only found out re-sending was safe by going and checking the files myself. Someone
using the product normally wouldn't do that.

Can it be reproduced?

I don't know, and I don't know what caused it.

What I can say:

• It happened once.
• Four earlier sub-stage confirmations in the same session were fine, and the one
  after it was fine too.
• The one that failed was the biggest sub-stage of the run - about twelve files,
  where the others had one or two. That might be relevant or might be coincidence.

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Recovery

Sending the confirmation again worked.

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Questions

1. Should the user see a plain-language message here instead? Something like
   "Couldn't complete that step - your work is saved, try again" would have told me
   what I needed, if that's accurate.

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