feat: complete phase 2 -- multi-agent routing, interrupt TTL, escalation, templates

- Intent classification with LLM structured output (single/multi/ambiguous)
- Discount agent with apply_discount and generate_coupon tools
- Interrupt manager with 30-min TTL auto-expiration and retry prompts
- Webhook escalation module with exponential backoff retry (max 3)
- Three vertical industry templates (e-commerce, SaaS, fintech)
- Template loading in AgentRegistry
- Enhanced supervisor prompt with dynamic agent descriptions
- 153 tests passing, 90.18% coverage

backend/templates/fintech.yaml

@@ -0,0 +1,31 @@
+agents:
+  - name: transaction_lookup
+    description: "Looks up transaction history, balances, and payment details. Use for queries about transactions and account activity."
+    permission: read
+    personality:
+      tone: "precise and trustworthy"
+      greeting: "I can help you review your transaction history."
+      escalation_message: "Let me connect you with our financial support team."
+    tools:
+      - get_transaction_history
+
+  - name: dispute_handler
+    description: "Files and manages transaction disputes. Use when the customer wants to dispute a charge or check dispute status."
+    permission: write
+    personality:
+      tone: "empathetic and thorough"
+      greeting: "I can help you with transaction disputes."
+      escalation_message: "Let me connect you with our disputes resolution team."
+    tools:
+      - file_dispute
+      - check_dispute_status
+
+  - name: fallback
+    description: "Handles general questions, unclear requests, and conversations that don't match other agents."
+    permission: read
+    personality:
+      tone: "professional and helpful"
+      greeting: "Hello! How can I help you today?"
+      escalation_message: "Let me connect you with a human agent who can better assist you."
+    tools:
+      - fallback_respond