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/G0119/spec.md

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+# 1. Goal
+A vehicle workshop plans the workload of its mechanics. A planning program calls
+one service of the class {{P}}WORKLOAD_PLANNER. The service groups the open
+repair jobs by mechanic and returns one row per mechanic.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The workshop receives the open repair jobs from an external planning system.
+  The start date arrives as a character field in the format YYYYMMDD.
+- The class is new. No other object is in scope.
+
+# 4. Contract
+- Create the class {{P}}WORKLOAD_PLANNER in package $TMP.
+- The class is public and final. It has a public constructor without parameters.
+- The class has these public types:
+  - ty_job with the components job_id (c LENGTH 10), mechanic (c LENGTH 8),
+    work_hours (i), start_date (c LENGTH 8).
+  - tt_job: a standard table of ty_job with an empty key.
+  - ty_workload with the components mechanic (c LENGTH 8), job_count (i),
+    total_hours (i), first_date (c LENGTH 8).
+  - tt_workload: a standard table of ty_workload with an empty key.
+- The class has this public method:
+  summarize
+    IMPORTING it_jobs            TYPE tt_job
+    RETURNING VALUE(rt_workload) TYPE tt_workload.
+- Do not add other public methods.
+
+# 5. Business rules
+1. A job is relevant if the job ID is not empty, the mechanic is not empty, and
+   the work hours are greater than zero. Ignore all other jobs.
+2. Group the relevant jobs by mechanic.
+3. The result has one row per mechanic:
+   - mechanic: the mechanic.
+   - job_count: the number of relevant jobs of this mechanic.
+   - total_hours: the sum of the work hours of these jobs.
+   - first_date: the earliest start date of these jobs.
+4. A start date is set if it is not empty and if it is not 00000000. When you
+   determine the earliest date, consider only set dates. If no job of a mechanic
+   has a set date, first_date is empty.
+5. Sort the result by mechanic in ascending order.
+6. If no relevant job exists, return an empty table.
+
+# 6. Constraints
+- Release target: 8.16.
+- Coding standards: Clean ABAP. Method length below 40 statements. No global
+  variables. No comment that restates the code.
+- Out of scope: do not change objects outside package $TMP.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.