When syncing JSONL to worktree, if the worktree has more issues than
local, merge them instead of blindly overwriting. This prevents fresh
clones from accidentally deleting remote issues when they sync with
fewer issues than the sync branch.
Root cause of GitHub #464: A fresh clone with sync-branch configured
would start with an empty database (since JSONL is on sync-branch, not
HEAD). When syncing, the local 1-issue JSONL would overwrite the
remotes 10-issue JSONL, and the subsequent 3-way merge would see this
as local deleted 9 issues causing deletion to win.
The fix compares issue counts and triggers a merge when local has fewer
issues than the worktree (remote). Uses 3-way merge with empty base to
combine both sets of issues.
Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>
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