fix: add source index.js, install script copies from source

- Add index.js to project root as source
- Add configSchema to openclaw.plugin.json
- Install script now copies these files from source to dist/
- Ensures dist/ is reproducible from source

index.js

@@ -1,21 +1,19 @@
-// PaddedCell Plugin Entry Point
-export const id = 'padded-cell';
-export const name = 'PaddedCell';
-export const version = '0.1.0';
-
-// Export tools (will be loaded by OpenClaw)
-export { pcexec } from './pcexec/dist/index.js';
-export { 
+const { pcexec } = require('./pcexec/dist/index.js');
+const { 
   safeRestart, 
   createSafeRestartTool, 
   StatusManager, 
   createApiServer,
-  startApiServer 
-} from './safe-restart/dist/index.js';
+  startApiServer,
+  SlashCommandHandler
+} = require('./safe-restart/dist/index.js');
 
-// Default export
-export default {
-  id,
-  name,
-  version,
+module.exports = {
+  pcexec,
+  safeRestart,
+  createSafeRestartTool,
+  StatusManager,
+  createApiServer,
+  startApiServer,
+  SlashCommandHandler,
 };