Fix the batch settlement report for a sync job

A TypeScript sync job caught every push error, returned null and filtered the nulls out, so failed financial records disappeared without a trace. An AI described it as "logged and skipped". The replacement reports one row per item, success or failure, so a reconciliation job can account for every record.

An assistant wrote settle_batch(item_ids, outcomes). It is in the editor. It has a bug. Find it and fix it.

Input and output:

• item_ids: the items in the batch, in order. Ids may repeat or be empty.
• outcomes: the result of pushing each item, in the same order: "ok" or "err:<reason>". The list may be shorter or longer than item_ids.
• Return one row per item, in order: "<id>=ok" or "<id>=failed:<reason>".

Rules the tests check:

• An item with no outcome (the list ran out) is "<id>=failed:no-result". Outcomes past the last item are ignored.
• An outcome of exactly "ok" is "<id>=ok". Nothing else counts as success: OK or ok do not.
• An outcome starting with "err:" is "<id>=failed:<reason>", where the reason is the rest of the text. An empty reason becomes unknown.
• Any other outcome is "<id>=failed:unknown".