feat: Add email integration plugin with IMAP/Exchange polling and SMTP reply

plugins/_email_integration/extensions/python/system_prompt/_20_email_context.py

@@ -0,0 +1,20 @@
+from helpers.extension import Extension
+from agent import LoopData
+from plugins._email_integration.helpers.dispatcher import CTX_EMAIL_HANDLER
+
+
+class EmailContextPrompt(Extension):
+
+    async def execute(
+        self,
+        system_prompt: list[str] = [],
+        loop_data: LoopData = LoopData(),
+        **kwargs,
+    ):
+        if not self.agent:
+            return
+
+        # Only inject email conversation context if this chat was started by email
+        if self.agent.context.data.get(CTX_EMAIL_HANDLER):
+            prompt = self.agent.read_prompt("agent.system.tool.email_reply.md")
+            system_prompt.append(prompt)