Cumulative, proof-driven root-cause analysis for incidents, failed runs, regressions, OOMs, API-limit errors, restarts, and stale-state failures. Integrates runtime evidence with competing hypotheses, code/config/git tracing, proof levels, and systemic fixes. Use when the user asks for an RCA, "why did this fail", or incident analysis. When the input is a workflow/run id, cloud logs, artifacts, or cache behavior, run workflow-rca first to collect the runtime evidence packet, then continue here.
