Mutation check done on all accepted tasks; mutant fixes; dump filter in proxy

- skip sy-subrc lines and CDS type lengths; CDS literal mutants; mutate helper classes
- proxy: sap_short_dumps shows only dumps of the current run
- 26/26 tasks pass; results in docs/faz1-tasarim.md 11g

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

tasks_gen/eval/G0019/faulty/m1_i_sales_class.ddls.asddls

@@ -0,0 +1,14 @@
+@AccessControl.authorizationCheck: #NOT_REQUIRED
+@EndUserText.label: 'Sales items by region and size class'
+define view entity {{P}}I_SALES_CLASS
+  as select from {{p}}sale
+{
+  key region                                                             as region,
+      count( * )                                                         as item_count,
+      sum( case when amount < 100 then 1 else 0 end )                    as small_count,
+      sum( case when amount < 100 and amount < 1000 then 1 else 0 end ) as medium_count,
+      sum( case when amount >= 1000 then 1 else 0 end )                  as large_count,
+      sum( amount )                                                      as total_amount
+}
+where status <> 'X'
+group by region