Copy sent mail to Sent folder; add message field to Poke webhook

- send_email only relayed via SMTP, which doesn't copy the message
  to Sent the way a provider's own webmail/Mail app does — that's a
  client-side IMAP APPEND step that was simply missing, so sent mail
  never showed up anywhere in the account. Added detect_sent_folder
  (mirrors detect_drafts_folder) and append the sent copy after a
  successful SMTP send.
- forward_to_poke's payload never included a top-level "message"
  field, which every documented /api/v1/inbound/api-message example
  uses to give the agent something actionable — without it the
  webhook could get accepted (200/success) but ingested as inert
  context with nothing to surface. Added _build_poke_message() to
  generate one from the email's from/subject/body.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/server.py

@@ -405,15 +405,53 @@ def detect_drafts_folder(client: IMAPClient) -> str:
     return "Drafts"
 
 
+def detect_sent_folder(client: IMAPClient) -> str:
+    folders = client.list_folders()
+    for flags, _delim, name in folders:
+        if b"\\Sent" in flags:
+            return name
+    for name in ("Sent", "Sent Messages", "Sent Items", "[Gmail]/Sent Mail", "INBOX.Sent"):
+        if client.folder_exists(name):
+            return name
+    return "Sent"
+
+
 # ---------------------------------------------------------------------------
 # Poke webhook
 # ---------------------------------------------------------------------------
 
 
+_BODY_PREVIEW_LIMIT = 2000
+
+
+def _build_poke_message(email_data: dict, account: dict) -> str:
+    """Build the natural-language 'message' Poke's api-message endpoint expects.
+
+    Every documented usage example for /api/v1/inbound/api-message wraps its
+    payload in a top-level 'message' string — the endpoint accepts "any JSON
+    object", but without 'message' there's nothing for Poke's agent to treat
+    as an actionable instruction, so it can ingest the payload as inert
+    context without ever surfacing a heads-up.
+    """
+    preview = (email_data.get("body_text") or "").strip()
+    if not preview and email_data.get("body_html"):
+        preview = "(HTML-only email — see body_html for content)"
+    if len(preview) > _BODY_PREVIEW_LIMIT:
+        preview = preview[:_BODY_PREVIEW_LIMIT] + "... (truncated, see body_text for full content)"
+
+    return (
+        f"New email received on {account['from_address']}\n"
+        f"From: {email_data['from']}\n"
+        f"Subject: {email_data['subject'] or '(no subject)'}\n\n"
+        f"{preview}"
+    )
+
+
 async def forward_to_poke(
     email_data: dict, account: dict, webhook_url: str, api_key: str
 ) -> bool:
     payload = {
+        "message": _build_poke_message(email_data, account),
         "account_id": account["id"],
         "from_address": account["from_address"],
         "from": email_data["from"],
@@ -1012,6 +1050,26 @@ async def send_email(
                 smtp.login(acc["smtp_username"], acc["smtp_password"])
                 smtp.sendmail(acc["smtp_username"], recipients, msg.as_string())
 
+        # SMTP relay doesn't copy the message to Sent the way a provider's
+        # own webmail/Mail app does — that's a client-side step over IMAP,
+        # so we have to do it ourselves or the message is never visible
+        # anywhere in the account after sending.
+        try:
+            imap = get_imap_client(acc)
+            try:
+                sent_folder = detect_sent_folder(imap)
+                if not imap.folder_exists(sent_folder):
+                    imap.create_folder(sent_folder)
+                imap.append(sent_folder, msg.as_bytes(), flags=[b"\\Seen"])
+            finally:
+                imap.logout()
+        except Exception as e:
+            logger.warning(
+                "Sent via SMTP but failed to save copy to Sent folder for '%s': %s",
+                acc["id"],
+                e,
+            )
+
         return {"success": True, "message_id": msg.get("Message-ID", "")}
 
     return await asyncio.to_thread(_send)