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

.gitignore

@@ -0,0 +1,67 @@
+# Build
+build/
+cmake-build-*/
+CMakeCache.txt
+CMakeFiles/
+*.cmake
+Makefile
+install_manifest.txt
+compile_commands.json
+
+# Compiled objects
+*.o
+*.a
+*.so
+*.dylib
+
+# Video files
+*.mp4
+*.mkv
+*.avi
+*.mov
+
+# ONNX models in models/ are tracked via Git LFS (see .gitattributes).
+# Any stray ONNX elsewhere is generated/downloaded and not tracked.
+external/*.onnx
+
+# Generated TensorRT engines (rebuilt by ORT / scripts/build_trt_engines.sh)
+trt_cache/
+
+# Gallery JSON files (generated)
+gallery.json
+gallery_*.json
+
+# Per-movie analysis output (generated by scene_analyze)
+death_of_stalin.json
+
+# Per-frame debug images
+images/
+
+# Annotations output
+annotations.json
+*_annotations.json
+
+# MovieNet evaluation data
+movienet-ps/
+
+# Eval probe images (data, regenerable)
+eval/probe/
+
+# Local reference repos kept for inspiration (each has its own .git)
+inspiration/
+
+# Python
+__pycache__/
+*.pyc
+*.pyo
+.venv/
+venv/
+
+# Editor / OS
+.vscode/
+.idea/
+.claude/settings.local.json
+*.swp
+*.swo
+.DS_Store
+Thumbs.db