refactor: complete bootstrap of ARNES agent harness framework

- Add complete agent harness structure with 8 roles (leader, triager, architect, implementer, reviewer, security, qa, documenter)
- Implement strict workflow with 9 stages and mandatory gates
- Add comprehensive verification script and runtime status tracking
- Create artifact-based evidence system with contracts and schemas
- Add agent policy matrix with permissions and anti-cheat rules
- Include test suite (44 tests passing) and CI-ready structure
- Add documentation: README, HOWTO, CHECKPOINTS, templates
- Configure model routing policies and token-aware task assignment
- Add BDD/SDD specification guides and feature templates
- Include starter pack for quick project onboarding

All verification checks pass. Framework ready for production use.

features/steps/common/README.md

@@ -0,0 +1,48 @@
+# Common Steps
+
+Steps reutilizables para múltiples features.
+
+## Navigation
+
+```python
+@given('el usuario está en la página principal')
+def step_at_home_page(context):
+    context.current_page = "home"
+
+@when('el usuario hace clic en el elemento de menú "{menu_item}"')
+def step_click_menu(context, menu_item):
+    context.menu_clicked = menu_item
+```
+
+## Error Handling
+
+```python
+@given('la conexión a internet está disponible')
+def step_internet_available(context):
+    context.internet_available = True
+
+@given('el servidor no responde')
+def step_server_down(context):
+    context.server_responding = False
+
+@then('el sistema muestra toast "{message}"')
+def step_show_toast(context, message):
+    context.toast_message = message
+```
+
+## User Session
+
+```python
+@given('el usuario tiene sesión activa')
+def step_user_logged_in(context):
+    context.user_logged_in = True
+    context.token = "valid_token"
+
+@then('el sistema muestra indicador de carga')
+def step_show_loading(context):
+    context.showing_loading = True
+
+@then('después de timeout muestra error "{message}"')
+def step_timeout_error(context, message):
+    assert context.timeout_error == message
+```