* fix(project): resolve default branch from origin/HEAD, not checked-out branch
Detecting the project default via `symbolic-ref --short HEAD` captured
whatever branch the repo happened to be on at add time. Adding a project
while on a feature branch (e.g. fix/pr-attachment) persisted that branch
as the default, so every session worktree based off it instead of main.
Prefer the remote default (origin/HEAD), falling back to the checked-out
branch only when no remote default is set. This still records a non-main
default like master correctly, while ignoring the active feature branch.
* test: cover branch-not-fetched API error
7d0ca02440