Initial commit: scene-actor-extraction pipeline

Source (KPN++ pipeline nodes, ArcFace embedders, SCRFD/YuNet detectors,
gallery builder), build scripts, and eval artifacts.

- external/KPN as a git submodule (gitea.tourolle.paris/dtourolle/KPN)
- ONNX models tracked via Git LFS (models/*.onnx)
- generated outputs, TensorRT engines, reference repos, and media ignored

eval/report.md

@@ -0,0 +1,20 @@
+# MovieNet Validation Report
+
+## Summary
+
+| Model | Rank-1 | Det.Fail | Mean-sim | Probes | Size  |
+| ----- | ------ | -------- | -------- | ------ | ----- |
+| R50   | 85.2%  | 10.0%    | 0.470    | 60     | 167MB |
+| R18   | 72.2%  | 10.0%    | 0.453    | 60     | 46MB  |
+| MBF   | 83.3%  | 10.0%    | 0.383    | 60     | 13MB  |
+
+## Per-Actor Recall
+
+| Actor              | R50          | R18          | MBF          |
+| ------------------ | ------------ | ------------ | ------------ |
+| Steve Buscemi      | 100% (9/9)   | 100% (9/9)   | 100% (9/9)   |
+| Michael Palin      | 88% (7/8)    | 50% (4/8)    | 62% (5/8)    |
+| Jason Isaacs       | 100% (10/10) | 100% (10/10) | 100% (10/10) |
+| Paddy Considine    | 50% (5/10)   | 50% (5/10)   | 60% (6/10)   |
+| Olga Kurylenko     | 89% (8/9)    | 67% (6/9)    | 100% (9/9)   |
+| Andrea Riseborough | 88% (7/8)    | 62% (5/8)    | 75% (6/8)    |