diff --git a/Setup.md b/Setup.md
index e69de29..0fd085e 100644
--- a/Setup.md
+++ b/Setup.md
@@ -0,0 +1,23 @@
+# Setup
+
+## Proven Setup Signals
+
+| Signal | Detail |
+|---|---|
+| package.json | name=cyberlux; scripts=prebuild, verify, dev, build, start, start:onion, health:stack, diagnose:onion, onions:status, onions:list; deps=next, react, react-dom, @tailwindcss/postcss, @types/node, @types/react, @types/react-dom, tailwindcss, typescript |
+| README files | README.md |
+
+## Setup Path
+
+- Install Node dependencies with the package manager used by the repo, then run the relevant script from package.json.
+
+## Environment Rules
+
+- Keep local secrets out of Git.
+- Put generated build output outside source control.
+- Prefer a clean checkout when validating setup instructions.
+- Record the exact command that works in the readiness issue before closing it.
+
+## Current Gaps
+
+- No setup gaps were inferred from inspected evidence.