chore(release): prepare v0.6.3

style(theme): update screenshot

style: format gulpfile and fix project url

refactor: move check-docker script to project root

feat(installer): add update subcommand for existing projects

docs: add contributing guidelines

refactor(theme): rebrand text domain and modernize block theme

fix: store gitignore as gitignore_template to survive npm publish

fix: add .npmignore and simplify installer file copy (v0.6.1)

chore: release v0.6.0

docs(changelog): reformat to conventional commits and add vNext

refactor(installer): replace external deps with native node APIs

fix(docker): add healthcheck and resolve chmod race condition

docs: add CLAUDE.md with project guidance for Claude Code

chore: update dependencies and project configuration