docs: add Setup wiki page

Setup.md

@@ -0,0 +1,13 @@
+# Setup
+
+## Purpose
+
+Software project. Keep setup, configuration, dependencies, deployment, and release notes explicit.
+
+## Local Requirements
+
+Document runtime, toolchain, hardware, environment variables, and dependency setup here.
+
+## First Run
+
+Add the smallest known-good setup path. Keep secrets in local environment files that are ignored by Git.