GET /git/refs lists local branches (upstream, ahead/behind, last commit,
merged, held by a worktree, protected), remote branches grouped by remote
and tags (target, annotated message/tagger/date). New writes in
server/lib/git-refs.js, dispatched from git-ops.js: branch-rename,
branch-upstream (set/unset), tag-create (light/annotated), tag-delete
(confirm), tag-push (one tag to origin, no --tags, no force), and
branch-create with a looked-up from + switch on a clean tree. Every ref is
looked up, never passed through; repo-wide writes are repo-root only
(ESUBDIR) and refused during any operation (EMERGING).
Client: git/BranchManager + TagManager dialog opened from the git bar's
tags icon, en+vi (gitRefs namespace), keyboard navigable.
# Conflicts:
# CLAUDE.md
# client/src/components/lanes/LaneGitBar.tsx
# docs/API.md
# server/__tests__/lanes-api.test.js
# server/routes/lanes.js
