Fix dashboard module resolution from any project directory

- Add automaton.pth to user site-packages so python -m automaton.dashboard
  works from any working directory, not just ~/.automaton/
- Add scripts/dashboard.sh as a convenience wrapper with PYTHONPATH

scripts/dashboard.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# Convenience wrapper to run the automaton dashboard from any directory.
+set -e
+
+FRAMEWORK_DIR="$HOME/.automaton"
+exec python3 -c "
+import sys
+sys.path.insert(0, '$FRAMEWORK_DIR')
+from automaton.dashboard.__main__ import main
+main()
+" "$@"