- Added `KeyPoints.visible` mask support for per-keypoint visibility
- Split confidence into `keypoint_confidence` and `detection_confidence`
- Kept legacy `KeyPoints.confidence` as deprecated forwarding alias
- Updated `KeyPoints` slicing/filtering to preserve visibility and confidence fields
- Fixed `KeyPoints.__getitem__` row-index normalization for NumPy scalar, 0-D array, and boolean indexing
- Fixed `detection_confidence` indexing to use normalized row indices
- Updated `VertexAnnotator` to skip invisible keypoints
- Updated `EdgeAnnotator` to skip invisible keypoints and edges
- Added per-class skeleton support to `EdgeAnnotator`
- Added multi-skeleton support to `VertexLabelAnnotator`
- Added label validation for `VertexLabelAnnotator`
- Added color-list length validation for keypoint annotators
- Added `VertexEllipseAreaAnnotator`
- Added `VertexEllipseOutlineAnnotator`
- Added `VertexEllipseHaloAnnotator`
- Kept/exported `VertexEllipseAnnotator` alongside the new ellipse variants
- Standardized keypoint annotator docstrings and executable examples
- Added/updated `validate_detection_confidence` and `validate_visible`
- Removed/cleaned old keypoint validator shims
- Added regression tests for visibility, confidence fields, multi-skeleton behavior, and indexing edge cases
- Updated helpers and RF-DETR/keypoint tests for the new confidence/visibility model
- Added API design principles to contributing docs
- Ignored local multi-skeleton test script in `.gitignore`
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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com>
Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: OpenAI Codex <codex@openai.com>
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