latest_prices: include_expired passthrough for historical data (#2)

ag_bids_mcp/server.py

@@ -176,13 +176,22 @@ def latest_prices(
         Field(description="Search radius in miles around the location (default 50). "
                           "Ignored unless a ZIP or lat/lng is given."),
     ] = None,
+    include_expired: Annotated[
+        bool,
+        Field(description="Include past/expired delivery months. Default off — only "
+                          "the current and future months are shown. Set true only when "
+                          "the farmer explicitly asks for historical/past delivery data."),
+    ] = False,
 ) -> str:
     """Snapshot of the latest scraped bid per (source, commodity, delivery).
 
     Every filter is optional and AND'd together — pivot by elevator, crop,
     delivery, or kind in any combination. Pass a `zip` (or `lat`+`lng`) with
     optional `radius_miles` to keep only elevators near the farmer, sorted
-    nearest-first with the distance shown."""
+    nearest-first with the distance shown.
+
+    By default this shows current + future delivery months only; expired
+    months are rolled off. Set `include_expired=true` for a historical view."""
     cm = commodity.strip().lower() if commodity else None
     with track("latest_prices", commodity=cm, source=source, delivery=delivery, kind=kind,
                zip=zip or "", radius=radius_miles or 0):
@@ -190,7 +199,8 @@ def latest_prices(
         if err:
             return err
         payload = client.latest(commodity=cm, source=source, delivery=delivery, kind=kind,
-                                zip=zip, lat=lat, lng=lng, radius_miles=radius_miles)
+                                zip=zip, lat=lat, lng=lng, radius_miles=radius_miles,
+                                include_expired=include_expired)
         return fmt.fmt_latest(payload)