0.12.1

For anyone comparing two ways of running the same agent work: prefixwise report --compare TASK TASK puts two tasks side by side with the difference, so one long session against several short ones (or one prompt layout against another) is one command, not a spreadsheet. SGLang and LMCache are now named in the package's one-line description and keywords on PyPI.

• Two tasks side by side: prefixwise report --compare TASK TASK. The same work done two ways (one long session against several short ones, one prompt layout against another) as two columns and the change between them: requests, prompt tokens, the share from cache, output tokens, avoidable tokens, cost and outcome. Asked for by someone comparing long and short sessions on their own gateway: the report summed the two tasks together, and the per-task table (--by task_id) was there but not mentioned. The report now points to both when a ledger holds more than one task. Cost is shown only for a task whose every request is priced, with enough digits to compare small runs.
• SGLang and LMCache in the PyPI summary and keywords. Both were supported and named in the README already; the one-line description and keywords now name them too.