feat: implement DCOS source tree, tests, and build configuration

Complete implementation of the DCOS package including:
- 40+ Python source files across agents, communication, core, learning, memory, protocols, utils
- pyproject.toml build configuration
- 102 unit tests across all subsystems
- Fixed flake.nix (Python 3.12, proper dependencies, pyproject build)
- Fixed .woodpecker.yml (correct paths, removed silent-fail flags)
- Added .gitignore
- Cleared stale pytest cache

tests/test_utils/test_config.py

@@ -0,0 +1,27 @@
+"""
+Tests for ConfigManager.
+"""
+
+import pytest
+from dcos.utils.config import ConfigManager
+
+
+class TestConfigManager:
+    def test_get_default(self):
+        config = ConfigManager()
+        assert config.get("version") == "1.0.0"
+
+    def test_set_and_get(self):
+        config = ConfigManager()
+        config.set("custom_key", "custom_value")
+        assert config.get("custom_key") == "custom_value"
+
+    def test_get_missing_default(self):
+        config = ConfigManager()
+        assert config.get("nonexistent", "fallback") == "fallback"
+
+    def test_all_settings(self):
+        config = ConfigManager()
+        settings = config.all_settings()
+        assert "version" in settings
+        assert "max_agents" in settings