Adicionar campo diretório de trabalho no modal de execução

- Campo execute-workdir no modal com valor pré-preenchido do agente
- Frontend envia workingDirectory na API de execução
- Backend aceita e aplica override de workingDirectory via metadata
- Pré-preenche com config do agente selecionado ao abrir modal
- Adiciona stopAll ao scheduler e limpa README

src/agents/manager.js

@@ -180,8 +180,13 @@ export function executeTask(agentId, task, instructions, wsCallback, metadata =
     effectiveInstructions += `\n\n<agentes_disponiveis>\n${agentList}\n</agentes_disponiveis>`;
   }
 
+  const effectiveConfig = { ...agent.config };
+  if (metadata.workingDirectoryOverride) {
+    effectiveConfig.workingDirectory = metadata.workingDirectoryOverride;
+  }
+
   const executionId = executor.execute(
-    agent.config,
+    effectiveConfig,
     { description: task, instructions: effectiveInstructions },
     {
       onData: (parsed, execId) => {

src/agents/scheduler.js

@@ -160,6 +160,13 @@ export function restoreSchedules(executeFn) {
   if (restored > 0) console.log(`[scheduler] ${restored} agendamento(s) restaurado(s)`);
 }
 
+export function stopAll() {
+  for (const [, entry] of schedules) {
+    entry.task.stop();
+  }
+  schedules.clear();
+}
+
 export function on(event, listener) {
   emitter.on(event, listener);
 }

src/routes/api.js

@@ -167,12 +167,14 @@ function buildContextFilesPrompt(contextFiles) {
 
 router.post('/agents/:id/execute', (req, res) => {
   try {
-    const { task, instructions, contextFiles } = req.body;
+    const { task, instructions, contextFiles, workingDirectory } = req.body;
     if (!task) return res.status(400).json({ error: 'task é obrigatório' });
     const clientId = req.headers['x-client-id'] || null;
     const filesPrompt = buildContextFilesPrompt(contextFiles);
     const fullTask = task + filesPrompt;
-    const executionId = manager.executeTask(req.params.id, fullTask, instructions, (msg) => wsCallback(msg, clientId));
+    const metadata = {};
+    if (workingDirectory) metadata.workingDirectoryOverride = workingDirectory;
+    const executionId = manager.executeTask(req.params.id, fullTask, instructions, (msg) => wsCallback(msg, clientId), metadata);
     res.status(202).json({ executionId, status: 'started' });
   } catch (err) {
     const status = err.message.includes('não encontrado') ? 404 : 400;