fix: catch sandbox pool exits in analyze_all background Task

The ANALYZE queries run via Task.Supervised which doesn't hold
sandbox ownership. rescue only catches exceptions; sandbox-pool
checkout failures come as exit signals. Add catch :exit so the
Task logs a warning instead of crashing.

lib/microwaveprop/weather.ex

@@ -197,6 +197,9 @@ defmodule Microwaveprop.Weather do
             Logger.info("Weather.analyze_all: ANALYZE #{t} done in #{elapsed}ms")
           rescue
             e -> Logger.warning("Weather.analyze_all: ANALYZE #{t} failed: #{inspect(e)}")
+          catch
+            :exit, reason ->
+              Logger.warning("Weather.analyze_all: ANALYZE #{t} sandbox exit: #{inspect(reason)}")
           end
         end)