bun is already baked into the jellytau-builder image (Dockerfile.builder),
so oven-sh/setup-bun@v1 was redundant. Fetching that GitHub-hosted action
from the self-hosted Gitea runner hangs the job before any steps run.
Removed from traceability-check, traceability, and publish-docs workflows;
build-and-test and build-release never used it and never stalled.
Add a docs-site (mdBook) with a Gitea publish-docs workflow, a
release-notes generator script (release:notes) that turns a commit
range's TRACES into grouped notes, the background-audio feature spec,
and CLAUDE.md. Ignore docs-site build artifacts.
dtourolle