Orchestrate E2E test triage and fix implementation: runs triage-ci then implement sequentially. Accepts test names, --agent, artifact path, or CI run reference. For individual phases, use /e2e:triage-ci, /e2e:debug, or /e2e:implement. Use when the user says "triage e2e", "fix e2e failures", or wants the full triage-to-fix pipeline.