Hard batch G0022-G0026: 5/5 accepted; budget floor, CDS checks, mutation check

- generator: budget floor (2x oracle activations, 3x calls), static checks for CDS
  $parameters and UNION annotation
- harness/mutation.py: deterministic mutants of the reference; hidden tests must fail
- G0022 revalidated with harness fixes: oracle 100, null 0
- results in docs/faz1-tasarim.md 11f

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tasks_gen/eval/G0026/reference/cx_rent_invalid.clas.abap

@@ -0,0 +1,30 @@
+CLASS {{p}}cx_rent_invalid DEFINITION
+  PUBLIC
+  INHERITING FROM cx_static_check
+  FINAL
+  CREATE PUBLIC.
+
+  PUBLIC SECTION.
+    METHODS constructor
+      IMPORTING textid    LIKE textid OPTIONAL
+                previous  LIKE previous OPTIONAL
+                iv_reason TYPE string OPTIONAL.
+
+    METHODS get_reason
+      RETURNING VALUE(rv_reason) TYPE string.
+
+  PRIVATE SECTION.
+    DATA mv_reason TYPE string.
+ENDCLASS.
+
+
+CLASS {{p}}cx_rent_invalid IMPLEMENTATION.
+  METHOD constructor.
+    super->constructor( textid = textid previous = previous ).
+    mv_reason = iv_reason.
+  ENDMETHOD.
+
+  METHOD get_reason.
+    rv_reason = mv_reason.
+  ENDMETHOD.
+ENDCLASS.