fix(logger): batch fix audit-logger, circular meta, and sync callers

- Make logAudit and closeAuditLogger synchronous (were async for no reason)
- Set audit-logger silent:true initially, enable on applyAuditConfig()
- Add try-catch for circular references in consoleFormat meta JSON
- Update all callers to remove unnecessary await/.catch() on sync functions
- Add comment to shared.ts explaining acceptable sync FS usage
- Fix audit-logger test for sync closeAuditLogger

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

tests/unit/audit-logger.test.ts

@@ -204,8 +204,8 @@ describe('Audit Logger - Real File Integration', () => {
   it('should close audit logger without errors', async () => {
     const { closeAuditLogger } = await import('../../src/main/services/logger/audit-logger')
 
-    // Should resolve without throwing
-    await expect(closeAuditLogger()).resolves.toBeUndefined()
+    // Should complete without throwing
+    expect(() => closeAuditLogger()).not.toThrow()
   })
 
   it('should handle special characters in fields', async () => {