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_resolver.py

@@ -0,0 +1,27 @@
+"""
+Tests for AddressResolver.
+"""
+
+import pytest
+from dcos.communication.resolver import AddressResolver
+
+
+class TestAddressResolver:
+    def test_resolve_by_name(self):
+        resolver = AddressResolver()
+        resolver.register("planner", "agent_001", role="planner")
+        assert resolver.resolve_by_name("planner") == "agent_001"
+
+    def test_resolve_by_role(self):
+        resolver = AddressResolver()
+        resolver.register("planner1", "agent_001", role="planner")
+        resolver.register("planner2", "agent_002", role="planner")
+        planners = resolver.resolve_by_role("planner")
+        assert len(planners) == 2
+
+    def test_unregister(self):
+        resolver = AddressResolver()
+        resolver.register("temp", "agent_temp")
+        removed = resolver.unregister("temp")
+        assert removed == "agent_temp"
+        assert resolver.resolve_by_name("temp") is None