Merge IAM U4 task history onto Dev main with synced component pins
Why: Dev main moved 479 commits ahead and the U4 component branches were re-synced onto their mains after the renderer line; the old gitlinks conflicted with main's renderer pins. The user authorized syncing U4 after the renderer line on 2026-10-18. Evidence: content is the agent-exec transportce403ff(cursor worker, unit dev-iam-u4-onto-main-11e40e7-r1, receipt /tmp/cleanup-20261018/render/u4-dev-onto-run.json, SELF), integrated with agent-exec apply onto main 11e40e7; this merge (strategy ours) only records U4 commitb081484as an ancestor and changes no content. Non-gitlink paths equal the mechanical merge tree d944fe8. Impact: modules/backend -> b4a19e7, modules/frontend -> ac45aa7, modules/documents -> 0b16daf; architecture baseline gains the backend/authz edges; the U4 card carries the replayed stage 7 evidence. Refs: Dev card feature-iam-u4-role-authority Co-authored-by: Cursor <cursoragent@cursor.com>
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