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_memory/test_procedural.py

@@ -0,0 +1,33 @@
+"""
+Tests for ProceduralMemory.
+"""
+
+import pytest
+from dcos.memory.procedural import ProceduralMemory
+
+
+class TestProceduralMemory:
+    def test_register_procedure(self):
+        mem = ProceduralMemory()
+        mem.register_procedure("build", ["init", "compile", "link"])
+        proc = mem.get_procedure("build")
+        assert proc is not None
+        assert len(proc["steps"]) == 3
+
+    def test_execute_procedure(self):
+        mem = ProceduralMemory()
+        mem.register_procedure("test_proc", ["step1", "step2"])
+        result = mem.execute_procedure("test_proc", {})
+        assert result["executed"] is True
+
+    def test_missing_procedure(self):
+        mem = ProceduralMemory()
+        with pytest.raises(KeyError):
+            mem.execute_procedure("nonexistent", {})
+
+    def test_list_procedures(self):
+        mem = ProceduralMemory()
+        mem.register_procedure("a", ["a1"])
+        mem.register_procedure("b", ["b1"])
+        procs = mem.list_procedures()
+        assert len(procs) == 2