sample: 补齐 L4-005/010 样本使其能被 YARA 规则命中

- L4-005: 加入 'meshsafe-hot-reload-test-string' → Newly_Added_Rule_Test
- L4-010: 加入 'powershell -enc SQBFAFgAI...' → Regex_Shell_Pattern

对账进步: 162/168 → 164/168 (97.6%)，剩余 4 条为样本占位符

tests/samples/L4-005_005_sample.txt

@@ -1 +1,4 @@
-rule hotload test
+This is a hot-reload test sample for MeshSafe YARA engine.
+The payload below should trigger Newly_Added_Rule_Test rule:
+
+meshsafe-hot-reload-test-string

tests/samples/L4-010_010_sample.txt

@@ -1 +1,5 @@
-regex pattern shell
+# MeshSafe YARA regex rule test sample
+# This should trigger Regex_Shell_Pattern
+
+attacker payload:
+powershell -enc SQBFAFgAIAAoACgAbgBlAHcALQAtAG8AYgBqAGUAYwB0ACAA