diff --git a/openspec/changes/agent-v16-sp-estimation/design.md b/openspec/changes/archive/2026-10-25-agent-v16-sp-estimation/design.md
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rename from openspec/changes/agent-v16-sp-estimation/design.md
rename to openspec/changes/archive/2026-10-25-agent-v16-sp-estimation/design.md