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/G0016/mutation.json

@@ -0,0 +1,67 @@
+{
+ "task": "G0016",
+ "mutants": [
+  {
+   "object": "{{P}}STOCK_NET",
+   "mutant": "line 43: >= -> < (rel)",
+   "status": "killed",
+   "hidden": "0/8",
+   "failed_tests": [
+    "ALL_GROUPS",
+    "DATE_FROM_FILTER",
+    "DATE_TO_FILTER",
+    "MATERIAL_FILTER",
+    "MOVE_COUNT",
+    "NET_QUANTITY",
+    "NO_MATCHING_DATA",
+    "SORT_ORDER"
+   ]
+  },
+  {
+   "object": "{{P}}STOCK_NET",
+   "mutant": "line 44: AND -> OR (logic)",
+   "status": "killed",
+   "hidden": "3/8",
+   "failed_tests": [
+    "ALL_GROUPS",
+    "DATE_FROM_FILTER",
+    "DATE_TO_FILTER",
+    "MATERIAL_FILTER",
+    "NO_MATCHING_DATA"
+   ]
+  },
+  {
+   "object": "{{P}}STOCK_NET",
+   "mutant": "line 53: <> -> = (rel)",
+   "status": "invalid",
+   "hidden": "0/0",
+   "failed_tests": []
+  },
+  {
+   "object": "{{P}}STOCK_NET",
+   "mutant": "line 58: = -> <> (eq)",
+   "status": "killed",
+   "hidden": "4/8",
+   "failed_tests": [
+    "DATE_FROM_FILTER",
+    "DATE_TO_FILTER",
+    "MATERIAL_FILTER",
+    "NET_QUANTITY"
+   ]
+  },
+  {
+   "object": "{{P}}STOCK_NET",
+   "mutant": "line 61: - -> + (arith)",
+   "status": "killed",
+   "hidden": "6/8",
+   "failed_tests": [
+    "DATE_TO_FILTER",
+    "NET_QUANTITY"
+   ]
+  }
+ ],
+ "valid": 4,
+ "killed": 4,
+ "kill_rate": 1.0,
+ "ok": true
+}