fix: step3 _normalize_rule 为空 sources 的 rule 添加最小 text source - Closes #64

防御性处理 LLM 输出中 sources 为空数组的情况，避免 Layer A schema 失败。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

skills/ir_generation_skill/step3_merge_and_audit.py

@@ -172,10 +172,9 @@ def _normalize_rule(rule: dict) -> dict:
     # Ensure table/text sources have a section field (defensive against LLM omission)
     # Also normalize invalid source types (LLM hallucinations like function_unit_description)
     sources = rule.get("sources", [])
-    if sources:
     valid_types = {"table", "text", "logic_tree"}
 
-        # try to infer a default section from sibling sources or the rule path
+    # try to infer a default section from the rule path
     default_section = ""
     for s in sources:
         sec = s.get("section", "")
@@ -187,15 +186,22 @@ def _normalize_rule(rule: dict) -> dict:
         if path:
             default_section = path.split(" > ")[0] if " > " in path else path
 
+    if sources:
         for src in sources:
             stype = src.get("type", "")
-            # Normalize invalid source types to "text"
             if stype and stype not in valid_types:
                 src["type"] = "text"
                 stype = "text"
             if stype in ("table", "text"):
                 if not src.get("section"):
                     src["section"] = default_section
+    else:
+        # Empty sources list — add a minimal text source (defensive against schema failure)
+        src = {"type": "text", "text_snippet": "inferred from rule context"}
+        if default_section:
+            src["section"] = default_section
+        sources.append(src)
+        rule["sources"] = sources
 
     return rule
 

skills/ir_generation_skill/tests/test_step3.py

@@ -526,3 +526,15 @@ class TestNormalizeRule:
         assert normalized["sources"][0]["type"] == "text"
         assert normalized["sources"][1]["type"] == "text"
         assert normalized["sources"][0]["section"] == "3.1 功能"
+
+    def test_normalize_empty_sources(self):
+        """Rules with empty sources get a minimal text source (defensive)."""
+        rule = {
+            "trigger": {"conditions": [{"signal": "x", "operator": "==", "value": "1"}]},
+            "path": "3.1 策略 > decision_speed",
+            "sources": [],
+        }
+        normalized = _normalize_rule(rule)
+        assert len(normalized["sources"]) == 1
+        assert normalized["sources"][0]["type"] == "text"
+        assert normalized["sources"][0]["section"] == "3.1 策略"