feat: initial ralph-workplan skill

Standalone Claude Code skill that ties a ralph loop to a workplan file.
Retires automatically when all tasks are done — no external dependencies.

- plugin/ralph-workplan.md      skill entrypoint
- plugin/scripts/check-done.sh  pre-start guard (reads workplan status)
- plugin/scripts/setup.sh       writes ralph state file with workplan-aware prompt
- install.sh                    copies plugin files to ~/.claude/plugins/
- workplan-spec.md              workplan file format reference
- README.md

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

install.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# install.sh — install the ralph-workplan skill into ~/.claude/plugins/
+#
+# Usage:
+#   ./install.sh              # install
+#   ./install.sh --uninstall  # remove
+
+set -euo pipefail
+
+PLUGIN_NAME="ralph-workplan"
+PLUGIN_SRC="$(cd "$(dirname "$0")/plugin" && pwd)"
+PLUGIN_DEST="${HOME}/.claude/plugins/${PLUGIN_NAME}"
+
+if [[ "${1:-}" == "--uninstall" ]]; then
+  if [[ -d "$PLUGIN_DEST" ]]; then
+    rm -rf "$PLUGIN_DEST"
+    echo "✅ Uninstalled: $PLUGIN_DEST"
+  else
+    echo "ℹ️  Not installed (nothing to remove)"
+  fi
+  exit 0
+fi
+
+# Install
+mkdir -p "${PLUGIN_DEST}/scripts"
+
+cp "${PLUGIN_SRC}/ralph-workplan.md"       "${PLUGIN_DEST}/ralph-workplan.md"
+cp "${PLUGIN_SRC}/scripts/check-done.sh"   "${PLUGIN_DEST}/scripts/check-done.sh"
+cp "${PLUGIN_SRC}/scripts/setup.sh"        "${PLUGIN_DEST}/scripts/setup.sh"
+
+chmod +x "${PLUGIN_DEST}/scripts/check-done.sh"
+chmod +x "${PLUGIN_DEST}/scripts/setup.sh"
+
+echo "✅ Installed: $PLUGIN_DEST"
+echo ""
+echo "   Skill:   /ralph-workplan <workplan-file> [--max-iterations N]"
+echo "   Spec:    $(cd "$(dirname "$0")" && pwd)/workplan-spec.md"
+echo ""
+echo "   Restart Claude Code for the skill to appear."