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When an agent created a sub-issue while working on a human's behalf, that human received no notifications for it at all. issue_subscriber modelled ACTOR identity, so an agent-created, agent-assigned issue had a full subscriber list and zero members to deliver to. The platform already knew who the work was for (agent_task_queue.originator_user_id, MUL-4302); notification never asked. - attribution.DelegatedSubscriber: one shared rule over the same origin waterfall ClassifyDirect uses. agent_create subscribes the originator as 'delegated'; quick_create keeps the direct 'creator' tier; autopilot and degraded attribution subscribe nobody. - Delegated is a reduced delivery tier: in_review/done/cancelled/blocked plus failures and mentions. Routine churn is suppressed, and the parent bubble cannot re-deliver what the tier dropped. - Unsubscribe becomes stateful: an unsubscribed_at tombstone survives later rule passes, and opt_out_scope distinguishes "this issue" from "this subtree" so a narrow opt-out no longer silently suppresses future children. - Subtree unsubscribe is its own endpoint. A body flag cannot fail loudly against an older backend (Go drops unknown fields); an unknown route 404s, which the UI now surfaces with a distinct message. - Eligibility and the write share one statement under a (workspace, user) advisory lock that subtree unsubscribe and member revoke also take, closing the check-then-insert races. Revoke additionally clears the departing member's subscriptions in the same tx. - UI explains a delegated subscription and offers both unsubscribe scopes. Migrations 249/250 add the delegated reason, the opt-out tombstone, and the opt-out scope, using NOT VALID + VALIDATE CONSTRAINT so the widened CHECK does not scan issue_subscriber under an exclusive lock. Reviewed across eight rounds; an earlier write-time subtree roll-up was built and then removed in full once it proved unfixable without serializing every topology mutation. The parent's own status transition already carries that signal. Closes MUL-5483.