retry on compaction/branch summarization retryable failures

[davidbrai]

fixes #6647

@badlogic questions:

1. do you think we should add a UI indication when a retry happens or no need?
2. I supposed we need to do a similar fix for agent-harness too?

[petrroll]

Absolutely not my place, but wouldn't defaulting to whatever is set in user settings/retry be more expected than static one immediate retry?

I get that setting is conceptually for something a bit different but as I used I'd expect it to govern most/all agentic layer operations. Compaction being one of them.

[davidbrai]

@petrroll yes, I agree. will update soon

[xl0]

@davidbrai Please see if you can make the retry (and transport) settinfs available to extensions. If I need to call models from the extension, I would prefer to have an option to use the current settings.

[badlogic]

@davidbrai

1. no, would complicate matters too much.
2. yes please.

@xl0 separate concern :)

[davidbrai]

closing. will open a separate pr