🐛 fix(tag): treat compound rolling channel aliases as floating even with digit suffixes

- Detect rolling alias patterns (latest-alpine, stable_arm64, dev.build) before numeric shape parsing
- Prevents isTagPinned from misclassifying rolling channels whose architecture or build markers contain digits

Author: s-b-e-n-s-o-n

app/tag/precision.test.ts

@@ -37,6 +37,14 @@ describe('tag/precision', () => {
       expect(getNumericTagShapeFromTransformedTag('1.2.3\rrc1')).toBeNull();
     });
 
+    test('extracts numeric segments after a multi-byte prefix', () => {
+      expect(getNumericTagShapeFromTransformedTag('🧪v1.2.3-alpine')).toEqual({
+        prefix: '🧪v',
+        numericSegments: ['1', '2', '3'],
+        suffix: '-alpine',
+      });
+    });
+
     test('returns null when the transformed tag trims to an empty string', () => {
       expect(getNumericTagShape('1.2.3', '^.*$ =>    ')).toBeNull();
     });
@@ -81,6 +89,12 @@ describe('tag/precision', () => {
       expect(isTagPinned('stable', undefined)).toBe(false);
     });
 
+    test('treats compound rolling channel aliases as not pinned', () => {
+      expect(isTagPinned('latest-alpine', undefined)).toBe(false);
+      expect(isTagPinned('stable_arm64', undefined)).toBe(false);
+      expect(isTagPinned('dev.build', undefined)).toBe(false);
+    });
+
     test('treats whitespace-only transformed tags as not pinned', () => {
       expect(isTagPinned('1.2.3', '^.*$ =>    ')).toBe(false);
     });

app/tag/precision.ts

@@ -110,11 +110,17 @@ export function isTagPinned(tag: string, transformTags: string | undefined): boo
     return false;
   }
 
+  // Rolling aliases like "stable-arm64" should remain floating even when a
+  // suffix contains digits (for example architecture or build markers).
+  if (isRollingTagAliasValue(transformedTag)) {
+    return false;
+  }
+
   if (getNumericTagShapeFromTransformedTag(transformedTag)) {
     return true;
   }
 
-  return !isRollingTagAliasValue(transformedTag);
+  return true;
 }
 
 export function classifyTagPrecision(