Implement first knowledge engine runtime slice

README.md

@@ -14,6 +14,7 @@ Start here:
 - `docs/markitect-tool-reuse-boundary.md`
 - `docs/system-layer-extraction-inventory.md`
 - `docs/system-layer-migration-backlog.md`
+- `docs/service-api-boundary.md`
 - `workplans/`
 
 ## Development
@@ -23,3 +24,7 @@ This repo uses Python 3.12+, setuptools, a `src/` package layout, and pytest.
 ```bash
 python3 -m pytest
 ```
+
+The first runtime slice implements artifacts, collections, relationships,
+in-memory storage, ingestion adapters, query, workflow run manifests, and
+agent-facing context packages.