feat(performance-alerts): rules-engine-driven alerts, persisted as PerformanceAlert

Phase A+B of the alerts overhaul:

- New PerformanceFactsProvider exposes agent.idleMinutes (from
  AgentSession), agent.busyMinutes, agent.totalCallsToday,
  agent.bookedCallsToday, agent.conversionPercent
- Implement EscalateActionHandler (was a stub): persists a
  PerformanceAlert row, dedupes per agent+type+IST date so a 5-min
  cron can't spam, updates value if it changes
- New PerformanceConsumer: setInterval every 5 min, reads on_schedule
  rules referencing agent.* facts, evaluates per agent, dispatches
  escalate actions
- Two starter rules in hospital-starter.json: excessive-idle (>60min)
  and low-conversion (<15% with >10 calls today). NPS deferred — no
  source signal exists yet
- New PerformanceAlertsController: GET /api/supervisor/performance-alerts
  (active list), POST /:id/dismiss, POST /dismiss-all
- Rules engine now injects EscalateActionHandler via DI so the action
  has access to PlatformGraphqlService for persistence

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/rules-engine/templates/hospital-starter.json

@@ -84,6 +84,51 @@
             "trigger": { "type": "on_schedule", "interval": "5m" },
             "conditions": { "all": [{ "fact": "call.slaBreached", "operator": "equal", "value": true }, { "fact": "call.callbackStatus", "operator": "equal", "value": "PENDING_CALLBACK" }] },
             "action": { "type": "escalate", "params": { "channel": "notification", "recipients": "supervisor", "message": "SLA breached — no callback attempted", "severity": "critical" } }
+        },
+        {
+            "ruleType": "automation",
+            "name": "Excessive idle time",
+            "description": "Agent has been idle for more than the configured threshold today",
+            "enabled": true,
+            "priority": 2,
+            "trigger": { "type": "on_schedule", "interval": "5m" },
+            "conditions": { "all": [{ "fact": "agent.idleMinutes", "operator": "greaterThan", "value": 60 }] },
+            "action": {
+                "type": "escalate",
+                "params": {
+                    "channel": "notification",
+                    "recipients": "supervisor",
+                    "message": "Excessive Idle Time",
+                    "severity": "warning",
+                    "alertType": "EXCESSIVE_IDLE",
+                    "valueFact": "agent.idleMinutes"
+                }
+            }
+        },
+        {
+            "ruleType": "automation",
+            "name": "Low conversion rate",
+            "description": "Agent's conversion (booked/total) is below the workspace floor",
+            "enabled": true,
+            "priority": 3,
+            "trigger": { "type": "on_schedule", "interval": "5m" },
+            "conditions": {
+                "all": [
+                    { "fact": "agent.conversionPercent", "operator": "lessThan", "value": 15 },
+                    { "fact": "agent.totalCallsToday", "operator": "greaterThan", "value": 10 }
+                ]
+            },
+            "action": {
+                "type": "escalate",
+                "params": {
+                    "channel": "notification",
+                    "recipients": "supervisor",
+                    "message": "Low Conversion",
+                    "severity": "warning",
+                    "alertType": "LOW_CONVERSION",
+                    "valueFact": "agent.conversionPercent"
+                }
+            }
         }
     ]
 }