feat: migrate UX tools to a formal Extension (ux-toolkit)

scripts/sync-skills.sh

@@ -1,36 +0,0 @@
-#!/bin/bash
-# sync-skills.sh - Syncs custom skills from the repo to the user's global ~/.gemini/skills folder.
-
-SKILLS_DIR="${HOME}/.gemini/skills"
-COMMANDS_DIR="${HOME}/.gemini/commands"
-REPO_SKILLS_PATH="packages/core/src/skills/builtin"
-
-mkdir -p "${SKILLS_DIR}"
-
-echo "Syncing skills..."
-
-# List of skills to sync
-CUSTOM_SKILLS=("_ux_git-worktree" "_ux_finish-pr" "_ux_designer")
-
-for SKILL in "${CUSTOM_SKILLS[@]}"; do
-    if [[ -d "${REPO_SKILLS_PATH}/${SKILL}" ]]; then
-        # Sync Skill
-        cp -r "${REPO_SKILLS_PATH}/${SKILL}" "${SKILLS_DIR}/"
-        echo "✅ Synced: ${SKILL}"
-
-        # Clean up legacy explicit command files if they exist to prevent conflicts.
-        # Gemini CLI automatically registers a slash command for each skill based on its name.
-        COMMAND_FILE="${COMMANDS_DIR}/${SKILL}.toml"
-        if [[ -f "${COMMAND_FILE}" ]]; then
-            rm -f "${COMMAND_FILE}"
-            echo "🧹 Cleaned up redundant command file: ${COMMAND_FILE}"
-        fi
-    else
-        echo "❌ Error: Skill ${SKILL} not found in ${REPO_SKILLS_PATH}"
-    fi
-done
-
-echo "Done. Run '/skills reload' in your Gemini session to apply changes."
-echo "--------------------------------------------------"
-echo ""
-cat WELCOME.md