Why: ResumeInterruptedChildren starts a background worker; the recovery-hold test returned while it could still write to a temporary workspace and SQLite store, causing cleanup races.
Evidence: SELF Root e3a full combination exposed the TempDir/database-close race; the corrected target passed 100 repetitions and full Backend Go tests passed in /tmp/dependency-recovery-hold-wait-green-20261014-01a1345f.json and /tmp/dependency-backend-test-repair-all-go-green-20261014-01a1345f.json.
Impact: Test teardown synchronization only; no production recovery behavior changes.
Refs: Backend PR #196; Dev PR #537; R14/R15
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