Why: Q3 (convergence and interop) completed across agent-native (#40), agent-squad (#46/#47) and backend (#99-#102); Dev gitlinks must track the merged component mains and the task card records the outcome before the completion declaration. Evidence: card increment table rows WP1a-WP6 with merged PR/SHA references; component CI statuses recorded as GATE in the card verification section; three-segment outputs (precheck/task-sync/test) appended via make evidence in follow-up commits on this branch. Impact: deps/agent-squad bcc8d08 -> 663e89e, deps/agent-native 1ac21c6 -> 37c5e6f, modules/backend 06934bc -> 4791b2e; task card filled. Refs: .task/feature-agent-stack-q3.md; Q3 plan 2026-10-07-agent-stack-q2q3-plans.md
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