Remove the accidentally committed runtime log

simple_lastrun_fetch_loop.log (142 KB of live-loop debug output)
slipped into af00932 - the repo only ignored the exact name
simple_lastrun.log.  The file is removed from the index and .gitignore
now covers simple_lastrun*.log, so the variants stay local.

865 Python + 883 frontend (unchanged).

.gitignore

@@ -5,4 +5,4 @@ __pycache__/
 dist/
 build/
 AGENTS.md
-simple_lastrun.log
+simple_lastrun*.log