Tune grip guard/frames per stability level, unify open speed 80%, rebuild aarch64 package

- Guard (release_min_hold_seconds): sensitive 0.4 s / stable 0.7 s / firm 1.0 s, label clarified
- Y-displacement samples 3-4-6, release_confirm_samples aligned 3-4-6 so the bar shows consistent frames
- release_open_speed 80% for all modes; level summary shows frames and open speed
- Rebuild ubuntu24.04 aarch64 lite 20261008 with stable-level-50 config; drop old release packages

Co-authored-by: Cursor <cursoragent@cursor.com>

release/GripperDemo02-ubuntu22.04-x86_64-lite-20260922.tar.gz.sha256

@@ -1 +0,0 @@
-5675c6f6400b3d9b3d27602c4639c307cb35d0357e658ec5c344aebdc7eba7c0  GripperDemo02-ubuntu22.04-x86_64-lite-20260922.tar.gz

release/GripperDemo02-ubuntu24.04-aarch64-lite-20260928.tar.gz.sha256

@@ -1 +0,0 @@
-4cea5bb537733c23893471158412e7f224be75fad57f29c17efdc05d2ae53649  GripperDemo02-ubuntu24.04-aarch64-lite-20260928.tar.gz

release/GripperDemo02-ubuntu24.04-aarch64-lite-20261008.tar.gz.sha256

@@ -1 +1 @@
-31be215931dd689ab774c9817196ce5fe5e130dee3230831421871c702bb59ed  GripperDemo02-ubuntu24.04-aarch64-lite-20261008.tar.gz
+afdec27bff2e0e4d5dc43f1678272eae8456336fd8cf4f0c6e0aee260abd8fa7  GripperDemo02-ubuntu24.04-aarch64-lite-20261008.tar.gz

release/GripperDemo02-ubuntu26.04-x86_64-lite-20260922.tar.gz.sha256

@@ -1 +0,0 @@
-8307c8fe39a850275c09b7a4092584216b8ee1bf7891ec0da12737604e7905d0  GripperDemo02-ubuntu26.04-x86_64-lite-20260922.tar.gz

release/GripperDemo02-windows-x64-lite-20260922.zip.sha256

@@ -1 +0,0 @@
-5f66fb92f4f3f17d129106fd436aeb56d5019f3d36f9dd81ae8a99ce847d6a69  GripperDemo02-windows-x64-lite-20260922.zip