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_communication/test_network.py

@@ -0,0 +1,36 @@
+"""
+Tests for CommunicationNetwork.
+"""
+
+import pytest
+from dcos.communication.network import CommunicationNetwork
+from dcos.communication.protocol import Message
+
+
+class TestCommunicationNetwork:
+    def test_connect_and_deliver(self):
+        net = CommunicationNetwork()
+        net.connect("a", "b")
+        msg = Message(sender="a", recipient="b", payload="test")
+        assert net.deliver(msg) is True
+
+    def test_disconnect(self):
+        net = CommunicationNetwork()
+        net.connect("a", "b")
+        net.disconnect("a", "b")
+        msg = Message(sender="a", recipient="b", payload="test")
+        assert net.deliver(msg) is False
+
+    def test_broadcast(self):
+        net = CommunicationNetwork()
+        net.connect("a", "b")
+        net.connect("a", "c")
+        count = net.broadcast("a", "broadcast message")
+        assert count == 2
+
+    def test_get_peers(self):
+        net = CommunicationNetwork()
+        net.connect("x", "y")
+        net.connect("x", "z")
+        peers = net.get_peers("x")
+        assert len(peers) == 2