Pipeline controller: plan 2 (hard +, error +50 %), backlog throttle, 2 trajectory workers, stop rules, summaries every 50; budget reserve

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

tasks_gen/train/G1027/seed/if_hire_fee.intf.abap

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+INTERFACE {{p}}if_hire_fee PUBLIC.
+  TYPES ty_amount TYPE p LENGTH 8 DECIMALS 2.
+  TYPES:
+    BEGIN OF ty_result,
+      fee      TYPE ty_amount,
+      discount TYPE ty_amount,
+    END OF ty_result.
+  METHODS calculate_fee
+    IMPORTING iv_days          TYPE i
+              iv_parts         TYPE i
+              iv_express       TYPE abap_bool
+    RETURNING VALUE(rs_result) TYPE ty_result.
+ENDINTERFACE.