fix: resolve linting issues in moderation.ts

- Fixed return-await issues by properly awaiting emitEvent calls
- Replaced template literal expressions with nullish coalescing for agent.did
- Removed unused parameter from checkAccountLabels function
- Made checkAccountLabels function non-async since it only returns null
- Applied nullish coalescing operator for better type safety

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[e-mail]>

src/moderation.ts

···
   await isLoggedIn;
   await limit(async () => {
     try {
-      return agent.tools.ozone.moderation.emitEvent(
+      return await agent.tools.ozone.moderation.emitEvent(
         {
           event: {
             $type: 'tools.ozone.moderation.defs#modEventLabel',
···
             cid,
           },
           // put in the rest of the metadata
-          createdBy: `${agent.did}`,
+          createdBy: agent.did ?? '',
           createdAt: new Date().toISOString(),
         },
         {
···
             did,
           },
           // put in the rest of the metadata
-          createdBy: `${agent.did}`,
+          createdBy: agent.did ?? '',
           createdAt: new Date().toISOString(),
         },
         {
···
   await isLoggedIn;
   await limit(async () => {
     try {
-      return agent.tools.ozone.moderation.emitEvent(
+      return await agent.tools.ozone.moderation.emitEvent(
         {
           event: {
             $type: 'tools.ozone.moderation.defs#modEventReport',
···
             cid,
           },
           // put in the rest of the metadata
-          createdBy: `${agent.did}`,
+          createdBy: agent.did ?? '',
           createdAt: new Date().toISOString(),
         },
         {
···
             did,
           },
           // put in the rest of the metadata
-          createdBy: `${agent.did}`,
+          createdBy: agent.did ?? '',
           createdAt: new Date().toISOString(),
         },
         {
···
             did,
           },
           // put in the rest of the metadata
-          createdBy: `${agent.did}`,
+          createdBy: agent.did ?? '',
           createdAt: new Date().toISOString(),
         },
         {
···
   });
 };
 
-export async function checkAccountLabels(did: string) {
+export function checkAccountLabels(_did: string) {
   /* try {
     const repo = await limit(() =>
       agent.tools.ozone.moderation.getRepo(