Label output with Aufgabe + strategy + index config, fix lock hangs

Two related improvements to make the test runs both usable and
diagnosable:

1. Avoid lock waits / "deadlock" hangs during CLUSTER
   The Manager connection ran EXPLAIN ANALYZE without committing, so
   psycopg2's default autocommit=False left an open transaction
   holding AccessShareLock on publ and auth. The next setup_db then
   blocked on DROP INDEX / CLUSTER (both need AccessExclusiveLock),
   visible as a hang -- typically at the CLUSTER step. Setting
   conn_postsql.autocommit = True releases the locks immediately after
   each SELECT, which is safe here because all Manager queries are
   read-only.

2. Make the run output identify which test is running
   The "Running: ..." line previously printed only the query key
   (query_1/query_2), shadowing 'strategy' with the dict key and never
   surfacing which join strategy or index config was active. Output
   now reads e.g. "[Aufgabe 3b | SortMergeStrategy | idx=nc-both]" by:
   - using self.__class__.__name__ so subclasses surface correctly
   - passing the current index_config from Manager into the strategy
   - threading an optional 'aufgabe' label through Manager.execute()
     and into each strategy's run() (including the Nested/SortMerge/
     Hash wrappers that override run()).

main.py now tags each execute() call with its assignment number.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

sortMergeStrategy.py

@@ -5,14 +5,14 @@ class SortMergeStrategy(BaseStrategy):
     def __init__(self, conn, db_name, all_queries):
         super().__init__(conn, db_name, all_queries)
 
-    def run(self):
+    def run(self, aufgabe: str | None = None):
         if self.db_name not in resolve:
             raise Exception("Sort-Merge Join not supported for " + self.db_name)
 
         for disable in resolve[self.db_name]["disable"]:
             self.cursor.execute(disable)
 
-        super().run()
+        super().run(aufgabe=aufgabe)
 
         for reset in resolve[self.db_name]["reset"]:
             self.cursor.execute(reset)