Rename waggle to spacebee and genericize for public use
Package renamed (src/waggle -> src/spacebee, imports, pyproject,
Dockerfile CMD). CI no longer hardcodes git.brads.house; registry
coordinates come from REGISTRY/IMAGE_NAME repo vars and REGISTRY_USER/
REGISTRY_TOKEN secrets, and the image build is gated on `vars.REGISTRY`
so forks stay test-only by default. docker-compose.yml takes its image
tag from $IMAGE (defaults to local spacebee:latest). README, CLAUDE.md,
and .env.example scrubbed of personal hosts/handles. Dropped the empty
readest adapter stub to narrow scope to Moon+ Reader WebDAV.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>