chore: add retoor header to all devplacepy source files and update style agent header rule

The diff adds the mandatory `retoor <retoor@molodetz.nl>` header comment to every `.py` file under `devplacepy/` (including `__init__.py` and `routers/__init__.py`), and updates the `StyleAgent` in `agents/style.py` to instruct agents to only add the header on created or already-edited files rather than sweeping the entire repo. The `agents/base.py` operating protocol is also revised to reorder and clarify tool discipline rules.

devplacepy/services/openai_gateway/__init__.py

@@ -1,3 +1,5 @@
+# retoor <retoor@molodetz.nl>
+
 from devplacepy.services.openai_gateway.service import GatewayService
 
 __all__ = ["GatewayService"]

devplacepy/services/openai_gateway/config.py

@@ -1,3 +1,5 @@
+# retoor <retoor@molodetz.nl>
+
 UPSTREAM_URL_DEFAULT = "https://api.deepseek.com/chat/completions"
 MODEL_DEFAULT = "deepseek-v4-flash"
 TIMEOUT_DEFAULT = 300

devplacepy/services/openai_gateway/gateway.py

@@ -1,3 +1,5 @@
+# retoor <retoor@molodetz.nl>
+
 import asyncio
 import json
 import logging

devplacepy/services/openai_gateway/service.py

@@ -1,3 +1,5 @@
+# retoor <retoor@molodetz.nl>
+
 import json
 import logging
 import os

devplacepy/services/openai_gateway/vision.py

@@ -1,3 +1,5 @@
+# retoor <retoor@molodetz.nl>
+
 import asyncio
 import hashlib
 import logging