search-with-proof: 1 GiB spooled verifier archive, tolerant text replies, transport retries

Built projects spool to /workspace without package caches (cap 1 GiB, both
sides); a plain-text model reply is fed back once; mailbox PUT/GET retry for up
to 90 s with idempotent re-send by seq; executor tasks are deleted on every exit
path.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

benchmarks/ax/batch.py

@@ -715,7 +715,7 @@ class SearchExecutorTask:
                 raise
             self.client = ObjectStoreExecutor(command_put, result_get)
             return self
-        except Exception as exc:
+        except BaseException as exc:
             self.__exit__(type(exc), exc, exc.__traceback__)
             raise
 
@@ -739,6 +739,7 @@ class SearchExecutorTask:
         if self.submitted:
             try:
                 self.lane.ax("delete", "task", self.name)
+                self.submitted = False
             except Exception as error:
                 errors.append(exception_reason(error))
         for key in self.keys: