Branch->project resolution (_project_slug_for_branch, _workspace_for_branch)
read task.project_id, which is null for a coordination root — so root-level
git ops (the root->master PR, the CEO merge) could not resolve a workspace.
A new _project_for_task falls through to the product's first distinct repo
(monorepo => the single repo) when project_id is null. Purely additive: a
task with a project_id resolves exactly as before; only the previously-
unresolvable root case changes.
Renn F
2ee610f6cf