fix(server): show self-resumed Claude subagents as running#23831

Merge main into fix/issue-16610

chore: register the self-resume fixture entry point

chore: follow namespace imports in the self-resume fixture

Merge main into fix/issue-16610

test(server): preserve the Claude self-resume runtime scenario

fix(server): drop the unneeded idle-root settle gate from the subagent self-resume fix

fix(server): a Claude subagent that resumes itself while the root is idle shows as running again

fix(server): a completed Claude subagent that resumes while the root is idle goes live again (#16610)

test(server): reproduce a completed Claude subagent not reopening on an idle self-resume (#16610)