Snapshot: new training tasks (balanced generation), docs

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

tasks_gen/train/G1953/reference/if_piano_tuning.intf.abap

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+INTERFACE {{p}}if_piano_tuning PUBLIC.
+  TYPES:
+    ty_code     TYPE c LENGTH 10,
+    ty_model    TYPE c LENGTH 4,
+    ty_visit_id TYPE c LENGTH 8,
+    BEGIN OF ty_visit,
+      visit_id    TYPE ty_visit_id,
+      model       TYPE ty_model,
+      pitch_dev   TYPE i,
+      distance_km TYPE i,
+      piano_count TYPE i,
+    END OF ty_visit,
+    tt_visits TYPE STANDARD TABLE OF ty_visit WITH EMPTY KEY,
+    BEGIN OF ty_summary,
+      accepted   TYPE i,
+      rejected   TYPE i,
+      first_code TYPE ty_code,
+    END OF ty_summary.
+
+  CONSTANTS:
+    BEGIN OF c_code,
+      ok       TYPE ty_code VALUE 'OK',
+      no_visit TYPE ty_code VALUE 'NO_VISIT',
+      model    TYPE ty_code VALUE 'MODEL',
+      pitch    TYPE ty_code VALUE 'PITCH',
+      distance TYPE ty_code VALUE 'DISTANCE',
+      too_many TYPE ty_code VALUE 'COUNT',
+    END OF c_code,
+    c_max_pitch    TYPE i VALUE 25,
+    c_max_distance TYPE i VALUE 60,
+    c_max_pianos   TYPE i VALUE 3.
+
+  METHODS check_visit
+    IMPORTING is_visit       TYPE ty_visit
+    RETURNING VALUE(rv_code) TYPE ty_code.
+
+  METHODS check_visits
+    IMPORTING it_visits      TYPE tt_visits
+    RETURNING VALUE(rv_code) TYPE ty_code.
+
+  METHODS summarise
+    IMPORTING it_visits         TYPE tt_visits
+    RETURNING VALUE(rs_summary) TYPE ty_summary.
+
+  METHODS count_blocked
+    IMPORTING it_visits TYPE tt_visits
+    EXPORTING ev_count  TYPE i
+              ev_code   TYPE ty_code.
+
+  METHODS is_tuning_model
+    IMPORTING iv_model         TYPE ty_model
+    RETURNING VALUE(rv_tuning) TYPE abap_bool.
+ENDINTERFACE.