docs: add public disclosure boundary

Author: LalaSkye

PUBLIC_DISCLOSURE_BOUNDARY.md

@@ -0,0 +1,15 @@
+# Public Disclosure Boundary
+
+This repository is a public inspection surface, not full architecture disclosure.
+
+It shows only what is needed to inspect the specific public claim attached to this repo: the bounded evidence object, the inspection path, and the claim limit.
+
+It must not be treated as a map of the wider system, a disclosure of protected architecture, or evidence of production deployment unless explicitly stated.
+
+Public inspection standard:
+
+```text
+claim -> evidence object -> inspection path -> claim limit
+```
+
+A local proof object proves only the local claim attached to it.