fix: polish OrbStack setup command and runtime wording

Author: liamvibecodes

SETUP.md

@@ -41,7 +41,7 @@ You need a container runtime to run the behind-the-scenes services. Pick one:
 OrbStack is faster and lighter than Docker Desktop (~2s startup, ~1GB RAM).
 
 ```bash
-brew install orbstack
+brew install --cask orbstack
 ```
 
 Or download from https://orbstack.dev. Open it once after installing.

scripts/auto-heal.sh

@@ -19,7 +19,7 @@ log "--- Health check started ---"
 
 # Check Docker is running
 if ! docker info &>/dev/null; then
-    log "ERROR: Docker not running. Cannot heal."
+    log "ERROR: Container runtime not running. Cannot heal."
     exit 1
 fi