zoto-compare-evals

Cross-run analysis across two or more eval runs driven by **report.yml**. Inputs are resolved per run directory under {evalsDir}/_runs/<ts>/; per-backend summaries are nested under **report.static** and **report.llm**. Emits a flat dataset (runs × cases × dimensions) plus the /canvas hand-off prompt, instructing the host agent to invoke Cursor's built-in /canvas tool. The skill never renders charts itself. Drill-down opens per-case log files. Does not call askQuestion — when a fragment (e.g. 20260503) matches multiple hourly folders and the Task lacks a disambiguator, emit schema-valid **needs_user_input** whose **options[].label** lists every full **{evalsDir}/_runs/<ts>/** candidate path (/z-eval-compare surfaces this without **askQuestion**).