Add create-dotfiles-archive.sh for portable dotfiles

Creates a standalone tar.gz that can be extracted on any machine:
- Includes all dotfiles from chezmoi
- Includes Claude marketplaces
- Uses __HOME__ placeholder for paths
- Includes setup-dotfiles.sh that fixes paths on extraction

dot_local/bin/executable_create-dotfiles-archive.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+# Create a portable dotfiles archive that can be extracted on any machine
+# Usage: ./create-dotfiles-archive.sh [output.tar.gz]
+
+set -e
+
+OUTPUT="${1:-dotfiles-portable.tar.gz}"
+TMPDIR="/tmp/dotfiles-archive-$$"
+LOCAL_HOME="$HOME"
+
+echo "Creating portable dotfiles archive..."
+mkdir -p "$TMPDIR/.claude/plugins"
+
+# Extract chezmoi dotfiles
+chezmoi archive --output=- | tar -xzf - -C "$TMPDIR"
+
+# Add marketplaces
+cp -r ~/.claude/plugins/marketplaces "$TMPDIR/.claude/plugins/"
+
+# Replace home path with placeholder in JSON files
+for f in "$TMPDIR/.claude/plugins/installed_plugins.json" "$TMPDIR/.claude/plugins/known_marketplaces.json"; do
+  if [ -f "$f" ]; then
+    sed -i.bak "s|$LOCAL_HOME|__HOME__|g" "$f"
+    rm -f "$f.bak"
+  fi
+done
+
+# Create setup script
+cat > "$TMPDIR/setup-dotfiles.sh" << 'SETUP'
+#!/bin/bash
+# Run this after extracting to fix paths for your home directory
+set -e
+cd ~
+for f in ~/.claude/plugins/installed_plugins.json ~/.claude/plugins/known_marketplaces.json; do
+  if [ -f "$f" ]; then
+    sed -i.bak "s|__HOME__|$HOME|g" "$f"
+    rm -f "$f.bak"
+  fi
+done
+echo "Dotfiles setup complete!"
+rm -f ~/setup-dotfiles.sh
+SETUP
+chmod +x "$TMPDIR/setup-dotfiles.sh"
+
+# Create the archive
+tar -czf "$OUTPUT" -C "$TMPDIR" .
+
+rm -rf "$TMPDIR"
+echo "Created: $OUTPUT"
+echo ""
+echo "To use on remote machine:"
+echo "  1. Copy $OUTPUT to the remote"
+echo "  2. cd ~ && tar -xzf $OUTPUT && ./setup-dotfiles.sh"