Implement phase-memory foundation

tests/test_planner.py

@@ -0,0 +1,32 @@
+import json
+from pathlib import Path
+
+from phase_memory.contracts import profile_from_markitect
+from phase_memory.planner import plan_profile_execution
+
+
+def test_profile_execution_plan_reports_capabilities_and_gates() -> None:
+    profile_data = json.loads((Path(__file__).parent / "fixtures" / "memory-profile.json").read_text(encoding="utf-8"))
+    profile = profile_from_markitect(profile_data).value
+
+    plan = plan_profile_execution(profile)
+
+    assert plan.ready
+    assert "activation.plan" in plan.capabilities
+    assert "retention.plan" in plan.capabilities
+    assert "durable_writes:review-gated" in plan.policy_gates
+    assert "secrets:denied" in plan.policy_gates
+    assert "phase_memory.profile.planned" in plan.observability_events
+
+
+def test_profile_execution_plan_degrades_when_adapter_is_missing() -> None:
+    profile_data = json.loads((Path(__file__).parent / "fixtures" / "memory-profile.json").read_text(encoding="utf-8"))
+    profile_data["stores"]["knowledge"] = "external-graph-store"
+    profile = profile_from_markitect(profile_data).value
+
+    plan = plan_profile_execution(profile, available_adapters={"local-event-log"})
+
+    assert not plan.ready
+    assert "external-graph-store" in plan.missing_adapters
+    assert plan.fallback_behavior["missing_runtime_store"] == "degrade-to-dry-run"
+    assert any(diagnostic.code == "missing_adapter" for diagnostic in plan.diagnostics)