Generator: pilot analysis and fixes; G0002-G0021 tasks; handover notes merged

- Static bundle checks (name length, seed type, reserved words, contract test classes,
  testclasses_file), local abaplint parser check before SAP, max_tokens, robust JSON parse
- Runner: G2 for CDS views with parameters, contract_check detail in report
- G0020 and G0013 fixed by review and revalidated (oracle 100, null 0)
- Pilot results in docs/faz1-tasarim.md 11e; handover notes merged into CLAUDE.md and docs

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

tasks_gen/eval/G0004/spec.md

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+# 1. Goal
+Analyse the age of stock batches. A warehouse report calls the analysis before it
+prints the stock aging report. The report needs the grouped quantity and the number
+of batches for each material and age bucket.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The interface {{P}}IF_STOCK_AGE exists in package $TMP. It is active.
+- The interface defines these types:
+  - ty_material: character, length 10.
+  - ty_batch_id: character, length 10.
+  - ty_bucket: character, length 2.
+  - ty_quantity: packed number, length 13, 3 decimals.
+  - ty_batch: structure with the components material, batch, quantity, gr_date.
+  - tt_batch: table of ty_batch.
+  - ty_age_row: structure with the components material, bucket, quantity, batch_count.
+  - tt_age_row: table of ty_age_row.
+  - ty_total: structure with the components material, quantity, batch_count.
+  - tt_total: table of ty_total.
+- The interface defines the constant structure C_BUCKET with the components
+  D0_30 = '01', D31_60 = '02', D61_90 = '03', D91_PLUS = '04'.
+- The interface defines two methods:
+  - analyze: importing it_batch type tt_batch and iv_key_date type dats,
+    returning rt_age type tt_age_row.
+  - total_by_material: importing it_batch type tt_batch and iv_key_date type dats,
+    returning rt_total type tt_total.
+
+# 4. Contract
+- Create the class {{P}}STOCK_AGE in package $TMP.
+- The class is public, final, and has a public constructor without parameters.
+- The class implements {{P}}IF_STOCK_AGE.
+- Do not add other public methods.
+
+# 5. Business rules
+Both methods use the same validity rules and the same age buckets.
+
+Validity
+1. A row of IT_BATCH is valid when its goods receipt date is not initial and is not
+   after IV_KEY_DATE.
+2. A row that is not valid is ignored. It must not change any result.
+
+Age and bucket
+3. The age of a batch is the number of days between its goods receipt date and
+   IV_KEY_DATE.
+4. The bucket of a batch is:
+   - age 0 to 30 days: bucket 01 (C_BUCKET-D0_30)
+   - age 31 to 60 days: bucket 02 (C_BUCKET-D31_60)
+   - age 61 to 90 days: bucket 03 (C_BUCKET-D61_90)
+   - age more than 90 days: bucket 04 (C_BUCKET-D91_PLUS)
+
+Method ANALYZE
+5. Group the valid rows by material and bucket.
+6. For each group, sum the quantity and count the valid rows.
+7. Return one row per group. Sort the result by material ascending and then by
+   bucket ascending.
+8. A group is in the result as soon as one valid row belongs to it, also when the
+   summed quantity is zero.
+9. If no valid row exists, return an empty table.
+
+Method TOTAL_BY_MATERIAL
+10. Group the valid rows by material only.
+11. For each group, sum the quantity and count the valid rows.
+12. Return one row per material. Sort the result by material ascending.
+13. If no valid row exists, return an empty table.
+
+Quantity
+14. The quantity of a batch can be negative. Add the quantities as they are.
+
+# 6. Constraints
+- Release target: SAP_BASIS 8.16 (ABAP Platform 2025).
+- Coding standards: Clean ABAP. Method length below 40 statements. No global
+  variables. No comment that restates the code. Pass large parameters by reference.
+- Out of scope: do not change {{P}}IF_STOCK_AGE.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.