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Propagate the 2026-07-01 two-sender revision (local VAD primary + brain advisory secondary) into the epoch-rationale sections. §2.1, §3.2, §6.1, §6.4 previously described barge_epoch as a forward-compat seam for a deferred local-VAD wrapper; with LocalVadReflex in-scope this slice, the epoch disambiguates the local-VAD primary trigger from the slower brain advisory landing on the same event (~300 ms later). Refs slice-4 spec §3.2, §6.1. DCO-signed. Signed-off-by: opencode controller <controller@local>