feat(create-basic-tools): add defensive parameter validation to generated tools

- Add defensive checks for required parameters in generated tool code
- Prevents crashes when tools are called with missing/empty params
- Returns descriptive error messages instead of undefined errors
- Update README with explanation of defensive pattern and best practices
- Bump to v1.0.5

Based on learnings from emoji-magic deployment:
- LLMs sometimes make probe calls with empty params
- Defensive checks prevent crashes and provide better error messages
- Even with Zod validation, runtime checks are valuable for robustness

packages/tools/create-basic-tools/src/generators/source-code.ts

@@ -23,6 +23,15 @@ export const ${exportName} = tool({
   description: '${description}',
   inputSchema: ${schemaName},
   async execute(input: z.infer<typeof ${schemaName}>) {
+    // Defensive check: Validate required parameters
+    if (!input.text || input.text.trim().length === 0) {
+      return {
+        success: false,
+        error: 'Missing required parameter: text',
+        message: 'The "text" parameter is required and cannot be empty.',
+      };
+    }
+
     // TODO: Implement the tool logic here
     console.log('${exportName} called with:', input);