feat: remove console statements from SDK code

- Remove all console.log, console.warn, and console.error from src/client and src/server
- Add ESLint no-console rule for client and server directories (excluding tests)
- Keep console statements in test files, examples, and CLI tools as intended

Addresses feedback in PR #665

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

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

src/client/index.ts

@@ -486,8 +486,8 @@ export class Client<
         try {
           const validator = this._ajv.compile(tool.outputSchema);
           this._cachedToolOutputValidators.set(tool.name, validator);
-        } catch (error) {
-          console.warn(`Failed to compile output schema for tool ${tool.name}: ${error}`);
+        } catch {
+          // Ignore schema compilation errors
         }
       }
     }