willexecutors: fee-bound is_valid (extremes allowed), is_selected flag-only; fix merge_will crash on missing date_to_check; DNSSEC async, ical folding, pyright/ruff cleanup; refresh karen7/samanta7 fixtures

bal/core/will.py

@@ -443,11 +443,12 @@ class Will:
         for wid in will:
             wtx = will[wid].tx
             found = False
+            inp = None
             for inp in wtx.inputs():
                 if inp.prevout.txid.hex() in will:
                     found = True
                     break
-            if not found:
+            if not found and inp is not None:
                 out[inp.prevout.to_str()] = inp
         return out