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/mutation.json

@@ -0,0 +1,61 @@
+{
+ "task": "G0019",
+ "mutants": [
+  {
+   "object": "{{P}}I_SALES_CLASS",
+   "mutant": "line 8: 100 -> 101 (const)",
+   "status": "killed",
+   "hidden": "6/8",
+   "failed_tests": [
+    "CLASS_BOUNDARIES",
+    "SMALL_COUNT"
+   ]
+  },
+  {
+   "object": "{{P}}I_SALES_CLASS",
+   "mutant": "line 9: >= -> < (rel)",
+   "status": "killed",
+   "hidden": "7/8",
+   "failed_tests": [
+    "MEDIUM_COUNT"
+   ]
+  },
+  {
+   "object": "{{P}}I_SALES_CLASS",
+   "mutant": "line 9: 1000 -> 1001 (const)",
+   "status": "killed",
+   "hidden": "6/8",
+   "failed_tests": [
+    "CLASS_BOUNDARIES",
+    "MEDIUM_COUNT"
+   ]
+  },
+  {
+   "object": "{{P}}I_SALES_CLASS",
+   "mutant": "line 10: sum( -> max( (agg)",
+   "status": "survived",
+   "hidden": "8/8",
+   "failed_tests": []
+  },
+  {
+   "object": "{{P}}I_SALES_CLASS",
+   "mutant": "line 13: <> -> = (rel)",
+   "status": "killed",
+   "hidden": "0/8",
+   "failed_tests": [
+    "CANCELLED_ITEMS_IGNORED",
+    "CLASS_BOUNDARIES",
+    "ITEM_COUNT",
+    "LARGE_COUNT",
+    "MEDIUM_COUNT",
+    "REGIONS_IN_RESULT",
+    "SMALL_COUNT",
+    "TOTAL_AMOUNT"
+   ]
+  }
+ ],
+ "valid": 5,
+ "killed": 4,
+ "kill_rate": 0.8,
+ "ok": true
+}