Copy: state the AI-free stance as a confidentiality benefit; record the exploration

SOUL.md

@@ -28,8 +28,10 @@ data lives in one place and the specs stay lean.
 ### 1. Local-Only by Default
 
 Everything runs in the browser. Snippets, datasets, and settings never leave the machine.
-No accounts, no uploads, no tracking. The only outbound requests are user-created
-URL-dataset fetches.
+No accounts, no uploads, no tracking, and the app contacts no third party on its own —
+including an AI model. The only outbound requests are user-created URL-dataset fetches.
+Because your work stays on the machine, confidential and work data are safe in Astrolabe
+from the first chart.
 
 ### 2. Vega-Lite Native, Not Vega-Lite Hidden
 
@@ -71,6 +73,9 @@ clever.
 - **Not a collaboration platform.** No multi-user, no sync, no comments. Import/export
   moves data between machines.
 - **Not a server app.** No backend, no rendering service, no account system.
+- **Not an AI tool.** No model authors, edits, or critiques charts, and nothing is sent to
+  one. The chart builder's recommendations are deterministic and rule-based, computed
+  locally — chosen over an LLM so results are explainable and nothing leaves the machine.
 
 ## Technical Philosophy