fix(install): switch from plugins/ to commands/ layout

Installs the skill directly to ~/.claude/commands/ralph-workplan.md
with absolute script paths baked in via sed substitution. Drops the
installed_plugins.json registry approach which is no longer needed.

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

install.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# install.sh — install the ralph-workplan skill into Claude Code's plugin system
+# install.sh — install the ralph-workplan skill into Claude Code's user commands
 #
 # Usage:
 #   ./install.sh              # install
@@ -9,26 +9,15 @@ set -euo pipefail
 
 PLUGIN_NAME="ralph-workplan"
 REPO_DIR="$(cd "$(dirname "$0")" && pwd)"
-PLUGINS_DIR="${HOME}/.claude/plugins"
+COMMANDS_DIR="${HOME}/.claude/commands"
-INSTALL_PATH="${PLUGINS_DIR}/cache/local/${PLUGIN_NAME}"
+SKILL_FILE="${COMMANDS_DIR}/${PLUGIN_NAME}.md"
-REGISTRY="${PLUGINS_DIR}/installed_plugins.json"
+SCRIPTS_SRC="${REPO_DIR}/plugin/scripts"
 
 # ── Uninstall ──────────────────────────────────────────────────────────────────
 if [[ "${1:-}" == "--uninstall" ]]; then
-  if [[ -d "$INSTALL_PATH" ]]; then
+  if [[ -f "$SKILL_FILE" ]]; then
-    rm -rf "$INSTALL_PATH"
+    rm -f "$SKILL_FILE"
-    echo "Removed: $INSTALL_PATH"
+    echo "Removed: $SKILL_FILE"
-  fi
-  # Remove from installed_plugins.json
-  if [[ -f "$REGISTRY" ]]; then
-    python3 - "$REGISTRY" "$PLUGIN_NAME" <<'PY'
-import json, sys
-path, name = sys.argv[1], sys.argv[2]
-d = json.load(open(path))
-d.setdefault("plugins", {}).pop(name, None)
-json.dump(d, open(path, "w"), indent=2)
-print(f"Removed '{name}' from {path}")
-PY
   fi
   echo "✅ Uninstalled: $PLUGIN_NAME"
   echo "   Restart Claude Code to apply."
@@ -36,31 +25,18 @@ PY
 fi
 
 # ── Install ────────────────────────────────────────────────────────────────────
-mkdir -p "${INSTALL_PATH}/commands"
+mkdir -p "$COMMANDS_DIR"
-mkdir -p "${INSTALL_PATH}/scripts"
 
-# Skill file goes in commands/ — that's where Claude Code looks
+# Write skill file with absolute script paths (avoids CLAUDE_PLUGIN_ROOT dependency)
-cp "${REPO_DIR}/plugin/ralph-workplan.md"     "${INSTALL_PATH}/commands/ralph-workplan.md"
+sed "s|\${CLAUDE_PLUGIN_ROOT}/scripts|${SCRIPTS_SRC}|g" \
-cp "${REPO_DIR}/plugin/scripts/check-done.sh" "${INSTALL_PATH}/scripts/check-done.sh"
+  "${REPO_DIR}/plugin/ralph-workplan.md" > "$SKILL_FILE"
-cp "${REPO_DIR}/plugin/scripts/setup.sh"      "${INSTALL_PATH}/scripts/setup.sh"
 
-chmod +x "${INSTALL_PATH}/scripts/check-done.sh"
+chmod +x "${SCRIPTS_SRC}/check-done.sh"
-chmod +x "${INSTALL_PATH}/scripts/setup.sh"
+chmod +x "${SCRIPTS_SRC}/setup.sh"
-
-# Register in installed_plugins.json so Claude Code discovers the plugin
-python3 - "$REGISTRY" "$PLUGIN_NAME" "$INSTALL_PATH" <<'PY'
-import json, sys
-path, name, install_path = sys.argv[1], sys.argv[2], sys.argv[3]
-try:
-    d = json.load(open(path))
-except (FileNotFoundError, json.JSONDecodeError):
-    d = {"version": 2, "plugins": {}}
-d.setdefault("plugins", {})[name] = [{"scope": "user", "installPath": install_path}]
-json.dump(d, open(path, "w"), indent=2)
-PY
 
 echo "✅ Installed: $PLUGIN_NAME"
-echo "   Path:  $INSTALL_PATH"
+echo "   Skill: $SKILL_FILE"
-echo "   Skill: /ralph-workplan <workplan-file> [--max-iterations N]"
+echo "   Scripts: ${SCRIPTS_SRC}/"
+echo "   Invoke: /ralph-workplan <workplan-file> [--max-iterations N]"
 echo ""
 echo "   Restart Claude Code for the skill to appear."