- A provider-supplied retry-after now bypasses the transient rate/concurrency
heuristic window instead of being overridden by it (regression from the
subscription-cap retry change).
- Updated event-controller/ui-helpers test doubles for provenance-gated
renderer selection (hasBuiltInTool), aggregated retryErrors on
auto_retry_end, and Bedrock override compat gaining streamIdleTimeoutMs.