Snapshot: new training tasks (balanced generation), docs

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

tasks_gen/train/G1931/spec.md

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+# 1. Goal
+The CDS view entity {{P}}I_RENTAL_FEE in package $TMP shows the fee of each
+rental of a car rental company. The view returns correct data, but its source
+is long and hard to read. Refactor the view in place. The behavior must stay
+the same.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- Table {{P}}RENTAL, package $TMP. One row for each rental.
+  Key: RENTAL_ID (CHAR 10).
+  Fields: CAR_GROUP (CHAR 1), SEASON (CHAR 1), RENTAL_DAYS (INT4).
+- The CDS view entity {{P}}I_RENTAL_FEE already exists in package $TMP. The
+  view is active. It reads the table {{P}}RENTAL.
+- The source of the view is the only specification of the fee. Read the
+  source before you change it.
+
+# 4. Contract
+- Refactor the CDS view entity {{P}}I_RENTAL_FEE in package $TMP. The name
+  stays the same. Do not create a second view.
+- Elements, with these names and this order: RENTAL_ID (key), CAR_GROUP,
+  RENTAL_DAYS, FEE.
+- The view keeps the annotation @AccessControl.authorizationCheck:
+  #NOT_REQUIRED.
+- The view shows one row for each row of the table {{P}}RENTAL.
+
+# 5. Business rules
+1. The behavior of the view stays the same. The FEE of each row must not
+   change.
+2. Rule 1 holds for all values of CAR_GROUP, SEASON and RENTAL_DAYS. This
+   includes values that the source does not name.
+3. The element names and the element order stay the same.
+
+# 6. Constraints
+- Release target: 8.16.
+- Coding standards: clean ABAP. The refactored source must be easy to read.
+  Remove the deep nesting and the repeated logic. Keep the expressions short.
+- Out of scope: do not change the table {{P}}RENTAL.
+
+# 7. Acceptance
+- The view {{P}}I_RENTAL_FEE is active and has no syntax error.
+- The hidden tests pass.
+- Write ABAP Unit tests with CL_CDS_TEST_ENVIRONMENT in a global test class.