feat: add setup flow for dedicated research agent

config/default.yaml

@@ -486,3 +486,20 @@ hooks:
 #       summarize emails, triage inbox items, and prepare quick replies.
 #       Be concise and match the operator's tone. Skip marketing emails.
 #       Never send messages without explicit instruction — draft only.
+
+# Optional: explicit intent rules for agent routing.
+# If enabled, these rules are evaluated before default sender/channel routing.
+# The research agent can already be auto-routed by prefix (`research ...`, `look up ...`)
+# when agent_configs.research exists and intents are disabled.
+#
+# intents:
+#   enabled: true
+#   match_threshold: 0.7
+#   rules:
+#     - name: route-research
+#       patterns: ["research *", "look up *", "lookup *"]
+#       target:
+#         type: agent
+#         name: research
+#       priority: 10
+#       enabled: true