refactor(kernel-utils): unexport collectSheafGuard from public index

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: grypez

packages/kernel-utils/src/index.test.ts

@@ -14,7 +14,6 @@ describe('index', () => {
       'abortableDelay',
       'calculateReconnectionBackoff',
       'callable',
-      'collectSheafGuard',
       'constant',
       'delay',
       'fallthrough',

packages/kernel-utils/src/index.ts

@@ -62,6 +62,5 @@ export {
   withRanking,
   fallthrough,
 } from './sheaf/compose.ts';
-export { collectSheafGuard } from './sheaf/guard.ts';
 export { makeRemoteSection } from './sheaf/remote.ts';
 export { makeSection } from './sheaf/section.ts';