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

public/app.html

@@ -998,6 +998,17 @@
             ></textarea>
           </div>
 
+          <div class="form-group">
+            <label class="form-label" for="execute-workdir">Diretório de Trabalho</label>
+            <input
+              type="text"
+              class="input"
+              id="execute-workdir"
+              value="/home/projetos/"
+              autocomplete="off"
+            />
+          </div>
+
           <div class="form-group">
             <label class="form-label">Arquivos de Contexto</label>
             <div class="dropzone" id="execute-dropzone">

public/js/api.js

@@ -38,8 +38,9 @@ const API = {
     create(data) { return API.request('POST', '/agents', data); },
     update(id, data) { return API.request('PUT', `/agents/${id}`, data); },
     delete(id) { return API.request('DELETE', `/agents/${id}`); },
-    execute(id, task, instructions, contextFiles) {
+    execute(id, task, instructions, contextFiles, workingDirectory) {
       const body = { task, instructions };
+      if (workingDirectory) body.workingDirectory = workingDirectory;
       if (contextFiles && contextFiles.length > 0) body.contextFiles = contextFiles;
       return API.request('POST', `/agents/${id}/execute`, body);
     },

public/js/app.js

@@ -874,6 +874,7 @@ const App = {
     }
 
     const instructions = document.getElementById('execute-instructions')?.value.trim() || '';
+    const workingDirectory = document.getElementById('execute-workdir')?.value.trim() || '';
 
     try {
       const selectEl = document.getElementById('execute-agent-select');
@@ -890,7 +891,7 @@ const App = {
       Terminal.disableChat();
       App._lastAgentName = agentName;
 
-      await API.agents.execute(agentId, task, instructions, contextFiles);
+      await API.agents.execute(agentId, task, instructions, contextFiles, workingDirectory);
 
       if (dropzone) dropzone.reset();
       Modal.close('execute-modal-overlay');

public/js/components/agents.js

@@ -366,6 +366,12 @@ const AgentsUI = {
 
       if (App._executeDropzone) App._executeDropzone.reset();
 
+      const selectedAgent = allAgents.find(a => a.id === agentId);
+      const workdirEl = document.getElementById('execute-workdir');
+      if (workdirEl) {
+        workdirEl.value = (selectedAgent?.config?.workingDirectory) || '/home/projetos/';
+      }
+
       AgentsUI._loadSavedTasks();
 
       Modal.open('execute-modal-overlay');