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Sub-issues under a parent can be grouped into ordered stages (issue.stage). The child-done -> parent notification + assignee wake now fire only when a stage barrier closes: every sub-issue in the lowest unfinished stage has reached a terminal status (done/cancelled). An unstaged sibling set is one implicit stage, so the parent is woken once when the last sub-issue finishes instead of on every child — the default fix for the fire-on-every-child cascade reported in discussion #4320 / MUL-3508. Stage advancement stays agent-driven: the server only detects the closed barrier and wakes the parent assignee, who decides whether to promote the next stage. - DB: nullable issue.stage (CHECK >= 1) + sqlc regen - API: stage on issue create/update/response and batch update - CLI: `issue create`/`issue update` --stage; new `issue children` command that lists sub-issues grouped by stage (table + json) - stageBarrierClosed / stageProgressSummary in issue_child_done.go, with the wake comment now stage-aware, plus unit tests - skill docs (multica-working-on-issues SKILL.md + source map) Web UI (create-form stage picker, sidebar edit, group-by-stage display) is a follow-up; the API already returns stage for it to consume. MUL-3508 Co-authored-by: multica-agent <github@multica.ai>