Rename Hightower components to Trebuchet

- Rename npm packages: @shannon/api -> @trebuchet/api, @shannon/worker -> @trebuchet/worker, @keygraph/shannon -> @trebuchet/cli
- Update CLI references from shannon/keygraph to trebuchet/trebuchet
- Update Dockerfile and CLAUDE.md to reflect new package names
- Update TypeScript imports in API to use @trebuchet/worker

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/cli/src/commands/start.ts

@@ -222,7 +222,7 @@ function printInfo(
   repoPath: string,
   workspacesDir: string,
 ): void {
-  const logsCmd = isLocal() ? `./shannon logs ${workspace}` : `npx @keygraph/shannon logs ${workspace}`;
+  const logsCmd = isLocal() ? `./trebuchet logs ${workspace}` : `npx @trebuchet/cli logs ${workspace}`;
   const reportsPath = path.join(workspacesDir, workspace);
 
   console.log(`  Target:     ${args.url}`);