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/config/resolver.ts

@@ -95,7 +95,7 @@ function loadTOML(): TOMLConfig | null {
   } catch (err) {
     const message = err instanceof Error ? err.message : String(err);
     console.error(`\nFailed to parse ${configPath}: ${message}`);
-    console.error(`\nRun 'npx @keygraph/shannon setup' to reconfigure.\n`);
+    console.error(`\nRun 'npx @trebuchet/cli setup' to reconfigure.\n`);
     process.exit(1);
   }
 }