add: install-local.sh script for local gt installation

scripts/install-local.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+# Install gt locally with proper version info
+# Run from any gastown rig directory
+
+set -e
+
+# Get version from source
+VERSION=$(grep 'Version.*=' internal/cmd/version.go | head -1 | cut -d'"' -f2)
+COMMIT=$(git rev-parse --short HEAD)
+BUILD_TIME=$(date -u +%Y-%m-%dT%H:%M:%SZ)
+
+echo "Building gt v${VERSION} (${COMMIT})..."
+
+go build -ldflags="-X github.com/steveyegge/gastown/internal/cmd.Version=${VERSION} \
+  -X github.com/steveyegge/gastown/internal/cmd.GitCommit=${COMMIT} \
+  -X github.com/steveyegge/gastown/internal/cmd.BuildTime=${BUILD_TIME}" \
+  -o /Users/stevey/gt/gt ./cmd/gt
+
+# Ensure symlink exists
+if [ ! -L ~/.local/bin/gt ]; then
+  ln -sf /Users/stevey/gt/gt ~/.local/bin/gt
+  echo "Created symlink ~/.local/bin/gt → /Users/stevey/gt/gt"
+fi
+
+echo "Installed:"
+/Users/stevey/gt/gt version