Fix coverage with several contract classes; table annotation and file path checks; clean task dir on write

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014aUaQeLnwbb1zTpN7kHeat

tasks_gen/eval/G0100/spec.md

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+# 1. Goal
+A purchasing department rates its suppliers. A scorecard program calls the rating
+before it prints the scorecard. The program needs the weighted score and the grade
+of a supplier.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- All objects are in package $TMP.
+- A supplier is rated in three criteria: price, quality, and delivery.
+- Each criterion gets an integer rating from 1 (very poor) to 5 (very good).
+- The scorecard program passes the three ratings to the class. It reads the score
+  and the grade from the result.
+
+# 4. Contract
+- Create the class {{P}}SUPPLIER_SCORE in package $TMP.
+- The class is public, final, and has a public constructor without parameters.
+- The class has these public types:
+  - TY_RATING: an integer type for one rating.
+  - TY_SCORE: a packed number with length 5 and 1 decimal place.
+  - TY_GRADE: a character type with length 1.
+  - TY_RESULT: a structure with the components SCORE (type TY_SCORE) and GRADE
+    (type TY_GRADE).
+- The class has exactly this public method:
+
+  METHODS evaluate
+    IMPORTING iv_price    TYPE ty_rating
+              iv_quality  TYPE ty_rating
+              iv_delivery TYPE ty_rating
+    RETURNING VALUE(rs_result) TYPE ty_result.
+
+- Do not add other public methods.
+
+# 5. Business rules
+Apply the rules in this sequence.
+
+1. A rating is valid if it is an integer from 1 to 5. If at least one of the three
+   ratings is not valid, return score 0.0 and grade 'X'.
+2. Quality is a knock-out criterion. If the quality rating is 1, return score 0.0
+   and grade 'X'.
+3. Calculate the weighted score:
+   score = (price * 40 + quality * 35 + delivery * 25) / 100.
+4. Round the score to one decimal place. Use commercial rounding, that is, round
+   half away from zero.
+5. Derive the grade from the rounded score:
+   - 4.5 or more: 'A'
+   - 3.5 or more: 'B'
+   - 2.5 or more: 'C'
+   - 1.5 or more: 'D'
+   - less than 1.5: 'E'
+
+# 6. Constraints
+- Release target: SAP_BASIS 816.
+- Coding standards: Clean ABAP. Every method has fewer than 40 statements. No
+  global variables. No comment that restates the code.
+- Out of scope: database access, ALV, dynpro, and changes to other objects.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.