v1.2.0

Adds npm-based install and update support for the Claude Code agy plugin.\n\n- Adds @vit129/agy-plugin-cc package metadata and agy-plugin-cc CLI\n- Adds install, update, and doctor commands\n- Adds opt-in auto-update via install --auto-update and /agy:setup --enable-auto-update\n- /agy:setup now checks npm for newer versions, notifying by default and auto-installing only when enabled\n- Bumps plugin/package version to 1.2.0