v0.17.4 — blocked goals still land work

• Landed work is recorded even while the goal reads blocked. "Blocked" almost always means the ROOT thread died, but slice completion and the ready-queue scheduler both refused to run in that state — so a worker could fix a defect, commit it, and call slice_done while the plugin silently discarded the completion and never merged the branch. Completion, integration, and staffing now proceed for blocked goals; only paused/complete stop the machinery.