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/G0022/seed/if_expense_claim.intf.abap

@@ -0,0 +1,14 @@
+INTERFACE {{p}}if_expense_claim PUBLIC.
+  TYPES ty_amount      TYPE p LENGTH 8 DECIMALS 2.
+  TYPES ty_currency    TYPE c LENGTH 3.
+  TYPES ty_cost_center TYPE c LENGTH 10.
+
+  TYPES:
+    BEGIN OF ty_claim,
+      amount      TYPE ty_amount,
+      currency    TYPE ty_currency,
+      claim_date  TYPE d,
+      cost_center TYPE ty_cost_center,
+      has_receipt TYPE abap_bool,
+    END OF ty_claim.
+ENDINTERFACE.