Fix for Explicit returns mixed with implicit (fall through) returns

[redreceipt]

• In general, to fix this class of issue you ensure all control-flow paths in a function either explicitly return a value (of a consistent type) or explicitly raise, so that no path falls through to an implicit None return.
• For with_retries.wrapper, the best minimal change is to add an explicit return func(*args, **kwargs) after the loop, which will only be reached if, for some reason, the loop completes without returning or raising. To preserve current semantics exactly, we should structure it so normal cases are unaffected and any theoretically fall-through path still returns a value of the same type as successful calls.
• Concretely, in jobs.py, within with_retries, modify the wrapper function so that after the for i in range(3): ... loop finishes, there is an explicit return func(*args, **kwargs) (or alternatively an explicit return None if we wanted that behavior; here, matching the normal successful behavior is better).
• No new imports or helper methods are needed; this is a local control-flow fix inside jobs.py.

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