feat(agent-office): 인스타 큐레이터 후보를 중복 제거 + 신뢰도 0.7+ 필터

_dedup_and_filter_keywords: score>=0.7만 남기고 동일 keyword 중복 제거
(최고 score 유지) 후 내림차순. _push_keyword_candidates가 이 필터를 거쳐
"확실한 것만" 전송, 후보 없으면 안내 메시지. 헬퍼 테스트 5건.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

agent-office/tests/test_insta_keyword_filter.py

@@ -0,0 +1,55 @@
+import os
+import sys
+import tempfile
+
+_fd, _TMP = tempfile.mkstemp(suffix=".db")
+os.close(_fd)
+os.unlink(_TMP)
+os.environ["AGENT_OFFICE_DB_PATH"] = _TMP
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.agents.insta import _dedup_and_filter_keywords, KEYWORD_MIN_SCORE
+
+
+def test_filters_below_threshold():
+    """score < 임계값(0.7) 키워드는 제외."""
+    kws = [
+        {"id": 1, "keyword": "금리인하", "category": "경제", "score": 0.9},
+        {"id": 2, "keyword": "환율", "category": "경제", "score": 0.6},  # 컷
+        {"id": 3, "keyword": "반도체", "category": "경제", "score": 0.71},
+    ]
+    out = _dedup_and_filter_keywords(kws, min_score=0.7)
+    kept = {k["keyword"] for k in out}
+    assert kept == {"금리인하", "반도체"}
+
+
+def test_dedup_keeps_highest_score():
+    """동일 keyword 중복 시 최고 score 1개만 유지."""
+    kws = [
+        {"id": 1, "keyword": "AI", "category": "경제", "score": 0.75},
+        {"id": 2, "keyword": "AI", "category": "기술", "score": 0.92},  # 같은 키워드, 더 높음
+    ]
+    out = _dedup_and_filter_keywords(kws, min_score=0.7)
+    assert len(out) == 1
+    assert out[0]["id"] == 2
+    assert out[0]["score"] == 0.92
+
+
+def test_sorted_by_score_desc():
+    kws = [
+        {"id": 1, "keyword": "a", "category": "c", "score": 0.72},
+        {"id": 2, "keyword": "b", "category": "c", "score": 0.95},
+        {"id": 3, "keyword": "c", "category": "c", "score": 0.80},
+    ]
+    out = _dedup_and_filter_keywords(kws, min_score=0.7)
+    assert [k["keyword"] for k in out] == ["b", "c", "a"]
+
+
+def test_empty_when_all_below_threshold():
+    kws = [{"id": 1, "keyword": "x", "category": "c", "score": 0.4}]
+    assert _dedup_and_filter_keywords(kws, min_score=0.7) == []
+
+
+def test_default_threshold_is_0_7():
+    assert KEYWORD_MIN_SCORE == 0.7