chore(8.0): final pre-RC1 sweep — API consistency, named errors, orphans, zero-cast codebase

tests/unit/utils/mutex.test.ts

@@ -71,12 +71,14 @@ describe('Mutex Safety Tests', () => {
     })
 
     it('should not deadlock with nested different keys', async () => {
+      let innerRan = false
       await mutex.runExclusive('key1', async () => {
         await mutex.runExclusive('key2', async () => {
-          // Should not deadlock
-          expect(true).toBe(true)
+          innerRan = true
         })
       })
+      // Reaching here at all proves no deadlock; assert the inner body ran.
+      expect(innerRan).toBe(true)
     })
 
     it('should handle errors in exclusive function', async () => {
@@ -89,9 +91,11 @@ describe('Mutex Safety Tests', () => {
       ).rejects.toThrow('Test error')
 
       // Lock should be released, so we can acquire it again
+      let reacquired = false
       await mutex.runExclusive('error-test', async () => {
-        expect(true).toBe(true)
+        reacquired = true
       })
+      expect(reacquired).toBe(true)
     })
 
     it('should handle high concurrency without resource exhaustion', async () => {