docs: render architecture & flow diagrams as draw.io charts

Replace ASCII-art diagrams across the README and docs/ with editable
.drawio sources plus exported PNGs, so the diagrams render clearly in
rendered markdown and can be maintained/regenerated instead of being
hand-edited as fragile text art. Non-diagram blocks (code, folder
trees, UI wireframes) were left as text.

docs/requirements/Component-DeploymentManager.md

@@ -22,24 +22,8 @@ Central cluster only. The site-side deployment responsibilities (receiving confi
 
 ## Deployment Flow
 
-```
-Engineer (UI) → Deployment Manager (Central)
-    │
-    ├── 1. Request validated + flattened config from Template Engine
-    │      (validation includes flattening, script compilation,
-    │       trigger references, connection binding completeness)
-    ├── 2. If validation fails → return errors to UI, stop
-    ├── 3. Send config to site via Communication Layer
-    │       │
-    │       ▼
-    │   Site Runtime (Deployment Manager Singleton)
-    │       ├── 4. Store new flattened config locally (SQLite)
-    │       ├── 5. Compile scripts at site
-    │       ├── 6. Create/update Instance Actor (with child Script + Alarm Actors)
-    │       └── 7. Report success/failure back to central
-    │
-    └── 8. Update deployment status in config DB
-```
+![deployment-flow](diagrams/deployment-flow.png)
+<!-- source: diagrams/deployment-flow.drawio — edit, then re-export with export-drawio.sh -->
 
 ## Deployment Identity & Idempotency