Add engineering architecture docs

README.md

@@ -38,13 +38,13 @@ python scripts/ingest_folder.py --path /path/to/notes
 
 ## Architecture
 
-```
+```text
 FastAPI (port 8100)
-  ├── Ingestion: markdown → parse → chunk → embed → store
-  ├── Retrieval: query → embed → vector search → rank
-  ├── Context Builder: retrieve → boost → budget → format
-  ├── SQLite (documents, chunks, memories, projects, interactions)
-  └── ChromaDB (vector embeddings)
+  |- Ingestion: markdown -> parse -> chunk -> embed -> store
+  |- Retrieval: query -> embed -> vector search -> rank
+  |- Context Builder: retrieve -> boost -> budget -> format
+  |- SQLite (documents, chunks, memories, projects, interactions)
+  '- ChromaDB (vector embeddings)
 ```
 
 ## Configuration
@@ -65,3 +65,11 @@ Set via environment variables (prefix `ATOCORE_`):
 pip install -e ".[dev]"
 pytest
 ```
+
+## Architecture Notes
+
+Implementation-facing architecture notes live under `docs/architecture/`.
+
+Current additions:
+- `docs/architecture/engineering-knowledge-hybrid-architecture.md`
+- `docs/architecture/engineering-ontology-v1.md`