feat(tree/repair): Q&A 反向补全 — 从 TRM4 supplement 迁移

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/unit/test_repair_supplement.py

@@ -0,0 +1,34 @@
+"""Q&A 反向补全单元测试。"""
+
+from __future__ import annotations
+
+from app.tree.repair.supplement import SupplementStats, deduplicate_field
+
+
+class TestDeduplicateField:
+    def test_removes_duplicates(self):
+        result = deduplicate_field(["Hello", "hello", "World", "HELLO"])
+        assert result == ["Hello", "World"]
+
+    def test_preserves_order(self):
+        result = deduplicate_field(["B", "A", "b", "C"])
+        assert result == ["B", "A", "C"]
+
+    def test_strips_whitespace(self):
+        result = deduplicate_field(["  hello  ", "hello"])
+        assert len(result) == 1
+
+    def test_empty_list(self):
+        assert deduplicate_field([]) == []
+
+    def test_skips_empty_strings(self):
+        result = deduplicate_field(["", "hello", "", "world"])
+        assert result == ["hello", "world"]
+
+
+class TestSupplementStats:
+    def test_defaults(self):
+        stats = SupplementStats()
+        assert stats.questions_analyzed == 0
+        assert stats.facts_injected == 0
+        assert stats.facts_skipped == 0