refactor: improve development workflow and code quality

- Add Spanish documentation for AGENTS.md and README.md
- Add pytest to main dependencies and taskipy for dev tasks
- Clean up unused imports across codebase
- Fix default config values for local development
- Update test fixtures to use standard pytest

pyproject.toml

@@ -9,6 +9,7 @@ dependencies = [
     "sabatron-tryton-rpc-client>=7.4.0",
     "python-dotenv>=1.0.0",
     "pydantic>=2.0.0",
+    "pytest>=9.0.2",
 ]
 
 [project.optional-dependencies]
@@ -21,3 +22,11 @@ test = [
 [tool.setuptools.packages.find]
 where = ["src"]
 include = ["*"]
+
+[dependency-groups]
+dev = [
+    "taskipy>=1.14.1",
+]
+
+[tool.taskipy.tasks]
+start = "fastmcp run ./src/tryton_mcp/server.py"