Server: drop the synchronous branch-name generator dep, use the
worktree slug as the initial branch, and move first-agent branch
auto-naming to an async post-creation step backed by a structured
LLM call. Guards against renaming when the placeholder branch has
already been changed.
App: make workspace and worktree archive optimistic, rolling back
the local hide if the daemon call fails, and suppress incoming
workspace upserts while an archive is pending.
7c85341a42