v0.6.9 - Support custom pose keypoint counts on Android (#556)

🌟 Summary

v0.6.9 fixes Android pose inference for custom keypoint models, making non-COCO pose models like hand-landmark models work correctly in the Ultralytics YOLO Flutter plugin 🤖📱

📊 Key Changes

• Custom Android pose keypoint support 🧍‍♂️✋
  Android pose parsing now detects the number of keypoints from the model output shape instead of assuming the standard 17-keypoint COCO pose format.

• Improved pose output handling 🔧
  The Android PoseEstimator now supports both common pose output layouts more dynamically, including anchor-grid outputs and capped end-to-end outputs.

• Better custom model compatibility 🚀
  Custom pose models, such as 21-keypoint hand landmark models, can now return all expected keypoints instead of being limited or rejected by a hardcoded output size.

• Cleaner Play Store packaging 📦
  The Play Store asset build script now includes only the approved bundled YOLO26 Android models in release builds, while preserving any local custom or benchmark model files after the build.

• Release workflow hardening 🔐
  Publishing is now restricted to the main branch, reducing the risk of accidental releases from feature branches.

• Test and repository cleanup 🧹
  Redundant example tests were removed, constructor-focused tests were renamed and clarified, and new AGENTS.md guidance was added for AI coding agents working in the repository.

• Version bump 🏷️
  Package surfaces were updated to 0.6.9, including Flutter, iOS podspec, example app version, and changelog entries.

🎯 Purpose & Impact

• More flexible pose apps ✅
  Developers can now deploy custom Android pose models with different keypoint counts, opening the door to use cases like hand tracking, face landmarks, sports-specific poses, and other specialized landmark models.

• Fewer model-shape failures 🛠️
  By deriving keypoint counts dynamically, the plugin is less brittle and better aligned with real-world custom YOLO pose exports.

• Safer app releases 🛡️
  Play Store builds are cleaner and more predictable, with only official YOLO26 bundled assets included in upload artifacts.

• More reliable publishing 🚢
  The release workflow change helps ensure GitHub releases and pub.dev publishing happen only from trusted main branch commits.

• Improved maintainability 📚
  Cleaner tests and contributor guidance make future development easier, while preserving confidence through formatting, analysis, Flutter tests, publish dry-runs, and Android debug APK validation.

What's Changed

• Filter Play Store bundled model assets by @glenn-jocher in #554
• Clean up Flutter test layout by @glenn-jocher in #557
• Add AGENTS.md agent guidance with CLAUDE.md symlink by @glenn-jocher in #558
• Restrict release workflow to the main branch by @glenn-jocher in #559
• Support custom pose keypoint counts on Android by @UltralyticsAssistant in #556

Full Changelog: v0.6.8...v0.6.9