Why: the parent must pin the merged component SHAs so the combined build and CI gate run against the delivered U2 code and U1 runbook. Evidence: backend origin-main merge commit of #137 and documents origin-main merge commit of #61 (fetched post-merge, replacing a stale pre-merge pin attempt). Impact: gitlink updates only. Refs: backend PR #137; documents PR #61.
ui
@ 76d6633736