Forge: reliability-loop cron route + ReliabilityEvent model

feature_id: FEAT-FORGE-RELIABILITY

New route apps/web/src/app/api/cron/reliability-loop/route.ts. Runs every 15 min via vercel.json. Fans out to sensors, records ReliabilityEvent { id, teamId, sensorName, ticketId?, evidence Json, autonomyDial, outcome (healed|escalated|no-op), errorText?, createdAt, runId }.