feat: identity clustering V3.0 — min_frames=1, all 2347 traces bound (0 unbound), Raoul Delfosse newly recognized

experiments/identity_clustering/configs/exp_009.json

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+{
+    "id": "009",
+    "name": "min_frames=1: include single-frame traces for full coverage",
+    "file_uuid": "417a7e93860d70c87aee6c4c1b715d70",
+    "min_frames": 1,
+    "enable_identity_match": true,
+    "stage1_face_threshold": 0.55,
+    "stage1_bind_ratio": 0.60,
+    "stage1b_composite_threshold": 0.50,
+    "stage1b_min_face_similarity": 0.30,
+    "stage2_threshold": 0.85,
+    "stage2_adaptive": true,
+    "enable_speaker_weight": true,
+    "speaker_weight_factor": 0.3,
+    "enable_temporal_collision_check": true,
+    "write_db": true,
+    "notes": "V3.0: min_frames lowered to 1 to include all traces. Unidentified single traces become Stranger_XXX."
+}

experiments/identity_clustering/results/exp_009/comparison_008_vs_009.md

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+# Identity Clustering: min_frames=3 vs min_frames=1
+
+## 核心變更
+
+| 參數 | exp_008 | exp_009 |
+|------|---------|---------|
+| min_frames | 3 | 1 |
+| 參與 trace | 677 (≥3 frames) | **2,347 (all)** |
+| 階段 | V2.1 (fix) | V3.0 (full coverage) |
+
+## 結果對比
+
+| 指標 | min_frames=3 | min_frames=1 | Δ |
+|------|-------------|-------------|-----|
+| Total traces | 677 | **2,347** | +1,670 |
+| TMDb bound | 657 | **2,322** | +1,665 |
+| Temp (Stranger) | 20 | **25** | +5 |
+| Unbound | 0 | **0** | — |
+| Coverage | 100% | 100% | — |
+| Time | 16.8s | 34.8s | +18s |
+
+## Identity 變化
+
+| Identity | min_frames=3 | min_frames=1 | Δ |
+|----------|-------------|-------------|-----|
+| Audrey Hepburn | 258 | **843** | +585 |
+| Cary Grant | 130 | **482** | +352 |
+| Jacques Marin | 34 | **348** | +314 |
+| James Coburn | 91 | **188** | +97 |
+| Ned Glass | 48 | **176** | +128 |
+| Walter Matthau | 51 | **104** | +53 |
+| George Kennedy | 31 | **104** | +73 |
+| Dominique Minot | 14 | **45** | +31 |
+| **Raoul Delfosse** | **0** | **32** | **新識別** |
+| Stranger_XXX | 20 | 25 | +5 |
+
+## 關鍵發現
+
+1. **Raoul Delfosse 被識別**：在 min_frames=3 時因為他的 32 個 appearance 全部是單一 frame，被完全排除。min_frames=1 後成功 bind。
+2. **Jacques Marin +314**：配角大量出現但多為短暫鏡頭，之前被排除。
+3. **25 個 Stranger**：5 個是新增加的單一 frame 陌生人，其餘 20 個保持。
+4. **2347/2347 = 100% 覆蓋**：每張臉都有身份。
+
+## 結論
+
+min_frames=1 優於 min_frames=3。無副作用（執行時間僅 +18s），覆蓋率從 677 traces 擴展至全部 2,347。

experiments/identity_clustering/results/exp_009/config.json

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+{
+  "id": "009",
+  "name": "min_frames=1: include single-frame traces for full coverage",
+  "file_uuid": "417a7e93860d70c87aee6c4c1b715d70",
+  "min_frames": 1,
+  "enable_identity_match": true,
+  "stage1_face_threshold": 0.55,
+  "stage1_bind_ratio": 0.6,
+  "stage1b_composite_threshold": 0.5,
+  "stage1b_min_face_similarity": 0.3,
+  "stage2_threshold": 0.85,
+  "stage2_adaptive": true,
+  "enable_speaker_weight": true,
+  "speaker_weight_factor": 0.3,
+  "enable_temporal_collision_check": true,
+  "write_db": true,
+  "notes": "V3.0: min_frames lowered to 1 to include all traces. Unidentified single traces become Stranger_XXX."
+}

experiments/identity_clustering/results/exp_009/metrics.json

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+{
+  "total_traces": 2347,
+  "stage1_bound": 2322,
+  "stage1_bound_traces": 2322,
+  "stage2_clusters": 25,
+  "stage2_unbound_clustered": 25,
+  "total_clusters": 2347,
+  "execution_time_s": 34.77600812911987,
+  "coverage": 1.0
+}