Fix IBEX_VERSION not passed to Node installer subprocess

The shell variable was not exported, so the Node installer always
fell back to v0.9-beta instead of the user-specified branch/tag.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: thefactremains

install-ibex

@@ -113,7 +113,7 @@ echo ""
 # Download and run the Node installer
 # Pinned to stable tag — future development happens on dev branch
 # Use </dev/tty so interactive prompts read from the terminal, not the pipe
-IBEX_VERSION="${IBEX_VERSION:-v0.9.1-beta}"
+export IBEX_VERSION="${IBEX_VERSION:-v0.9.1-beta}"
 TMPFILE=$(mktemp /tmp/ibex-install.XXXXXX)
 trap 'rm -f "$TMPFILE"' EXIT INT TERM
 curl -fsSL "https://raw.githubusercontent.com/Percona-Lab/IBEX/${IBEX_VERSION}/install-node.cjs" > "$TMPFILE"