fix: Add project detection to hook scripts

docs: Remove video link, keep GIF only

feat: Replace demo video with optimized version (11MB)

feat: Add demo GIF and video to README

docs: Add Upgrading section with two-step update process

docs: Fix Claude Code launch command and remove upgrade note

docs: Refine README - fix username, enhance architecture, update install flow

chore: Remove obsolete install scripts (plugin-only now)

docs: Polish README for plugin release (v1.2.0)

fix: Update finalsetup.sh search path in techlead-setup command

fix: Change repository field to string in plugin.json

fix: Update marketplace.json source to use ./ prefix

fix: Move marketplace.json to .claude-plugin/ directory

chore: Make MIGRATION-GUIDE.md local-only

fix: Correct plugin hook paths and improve uninstall safety