chore: set up pre-commit framework with general hooks

Add .pre-commit-config.yaml with pre-commit-hooks v5.0.0 (trailing
whitespace, end-of-file fixer, yaml/json checks, large file guard,
merge conflict detection). Add minimal pyproject.toml. Auto-fix
trailing whitespace and missing end-of-file newlines across the
codebase.

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

src/config.ts

@@ -36,7 +36,7 @@ export type Config = z.infer<typeof ConfigSchema>;
 
 /**
  * Load configuration from file
- * 
+ *
  * @param configPath Path to the configuration file (optional)
  * @returns Loaded and validated configuration
  */
@@ -44,22 +44,22 @@ export async function loadConfig(configPath?: string): Promise<Config> {
   try {
     // Determine which config file to load
     const filePath = configPath || DEFAULT_CONFIG_PATH;
-    
+
     // Check if file exists
     if (!existsSync(filePath)) {
       logger.warn(`Configuration file not found: ${filePath}, using defaults`);
       return ConfigSchema.parse({});
     }
-    
+
     // Read and parse configuration
     const configData = await readFile(filePath, 'utf-8');
     const config = JSON.parse(configData);
-    
+
     // Validate configuration
     return ConfigSchema.parse(config);
   } catch (error) {
     logger.error(`Error loading configuration: ${error}`);
-    
+
     // Return default configuration
     return ConfigSchema.parse({});
   }