[rupayon123]

FireBatch documents unsupported inputs as ignored, but a nil or other non-event value after a failed event appends that event's error again. A batch with two actual failures can return four errors.

Keep the temporary error inside each iteration. Real event errors retain their order and identity, and ignored values no longer duplicate an earlier failure.

Go 1.26.0 / macOS arm64 validation:

• Four regressions fail before the fix; all new cases and the valid-batch controls pass afterward.
• The required full coverage run passes 45 leaf cases across both packages. Affected batch cases also pass with the race detector.
• Build, vet, tidy, formatting and Staticcheck pass. Revive has the same 34 existing warnings as the base.
• Independent native consumers compare 100 batches with individual dispatches, covering error identity/order, listener effects, wildcard/abort handling and invalid event names.

The full race run still fails four existing async/shared-data tests, all reproduced on the pristine base. Those failures are not suppressed or changed here. Hosted Linux/Go CI remains unverified locally.