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/G0106/seed/appl_sample.func.abap

@@ -0,0 +1,15 @@
+FUNCTION {{p}}appl_sample
+  IMPORTING
+    iv_years TYPE i
+  EXPORTING
+    ev_note TYPE string
+  EXCEPTIONS
+    invalid_years.
+
+  IF iv_years < 0.
+    RAISE invalid_years.
+  ENDIF.
+
+  ev_note = |{ iv_years } years of experience|.
+
+ENDFUNCTION.