sre-agent

SRE Agent: oncall alert triage, diagnosis root cause analysis, patrol preventive inspection, iteration self-improvement. Use when the user says "oncall", "check alerts", "start oncall", "patrol", "health check", "retrospective", "iterate", "improve sre-agent", or provides PagerDuty alert content, or asks to query/acknowledge/resolve PagerDuty incidents. Should also trigger even if the user just says "check what…