Under high concurrency (17+ agent sessions), each gt command invokes
bd version to validate minimum beads version. The resolveBranch()
function was spawning git subprocesses (git symbolic-ref) which caused
severe contention and timeouts when many agents ran simultaneously.
Changes:
- Remove git subprocess fallback in resolveBranch()
- Branch info now only comes from ldflags or build info's vcs.branch
- Version number (what gt actually checks) is unaffected
- Update documentation to reflect the change
The fix reduces bd version from potentially 2 git subprocesses to zero,
eliminating the contention issue under high agent concurrency.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
