Fix coverage with several contract classes; table annotation and file path checks; clean task dir on write

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014aUaQeLnwbb1zTpN7kHeat

tasks_gen/eval/G0188/review.json

@@ -0,0 +1,7 @@
+{
+ "decision": "accept",
+ "note": "Real in-place I task: wash/dry rates, unknown service and rounding come only from the legacy code; tests check them. Survived mutant: round dec const.",
+ "by": "Claude",
+ "date": "2026-10-03",
+ "failed_checks": {}
+}