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/G0113/spec.md

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+# 1. Goal
+A laboratory receives blood samples. Each sample has a sample ID, a test type and a
+priority. The laboratory groups the samples into batches. One batch belongs to each
+test type. A laboratory program adds the samples one by one. Then it reads the
+batches.
+
+Create the class {{P}}SAMPLE_BATCHER. The class collects the samples and gives the
+batches.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The class is new. It is in package $TMP.
+- No other object is necessary.
+- A laboratory program creates one instance of the class. It adds all samples of a
+  shift. Then it reads the batches.
+
+# 4. Contract
+Class {{P}}SAMPLE_BATCHER. The class is public and final. It can be created without
+parameters.
+
+Public types:
+- ty_test_type TYPE c LENGTH 4
+- ty_sample_id TYPE c LENGTH 10
+- ty_priority TYPE i
+- ty_batch with the components test_type (TYPE ty_test_type), total (TYPE i) and
+  urgent (TYPE i)
+- tt_batches TYPE STANDARD TABLE OF ty_batch WITH EMPTY KEY
+
+Public methods:
+- add_sample
+  IMPORTING iv_sample_id TYPE ty_sample_id
+            iv_test_type TYPE ty_test_type
+            iv_priority  TYPE ty_priority
+  RETURNING VALUE(rv_added) TYPE abap_bool
+- get_batches
+  RETURNING VALUE(rt_batches) TYPE tt_batches
+- get_batch
+  IMPORTING iv_test_type TYPE ty_test_type
+  RETURNING VALUE(rs_batch) TYPE ty_batch
+
+Do not add other public methods.
+
+# 5. Business rules
+
+add_sample
+1. Normalize the sample ID and the test type. Remove all spaces. Convert all letters
+   to upper case.
+2. Reject the sample and return abap_false if one of these conditions is true:
+   - the normalized sample ID is empty, or
+   - the normalized test type is empty, or
+   - the priority is not 1, 2 or 3, or
+   - the normalized sample ID was already added.
+   The state of the object does not change.
+3. Else accept the sample and return abap_true. The batch of the test type gets one
+   more sample. If the priority is 1, the batch also gets one more urgent sample.
+
+get_batches
+4. Return one row for each test type that has at least one sample.
+5. Sort the rows by the test type in ascending order.
+
+get_batch
+6. Normalize the test type in the same way as in rule 1.
+7. If the test type has at least one sample, return its row.
+8. Else return a row with this test type, total = 0 and urgent = 0.
+
+# 6. Constraints
+- Release target: 8.16.
+- Coding standards: Clean ABAP. Methods below 40 statements. No global variables. No
+  comment that restates the code.
+- Out of scope: no other object is part of this task.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.