Keep handoff-related docs aligned after the runtime refresh

Constraint: every documented progress step in this lane must update changelog, checklist, and handoff together before pushing
Rejected: leaving the handoff refresh isolated | it would break the repo's own continuity ritual and make the next session diff harder to trust
Confidence: high
Scope-risk: narrow
Directive: when the voice service state changes, mirror it across changelog, checklist, and handoff in the same push
Tested: /usr/local/miniconda3/bin/python -m unittest discover -s acr-engine/tests -v
Not-tested: successful end-to-end /recognize/voice payload within timeout

+- `docs/session-handoff.md` 已刷新为最新 voice service runtime 状态，明确 `/health` 可用、`/recognize/voice` 仍超时，以及下一步最短排查路径
 
 ## 2026-06-03 voice-to-chunk and context export foundation
 

@@ -49,3 +49,5 @@ flowchart TD
 - `/recognize/voice` 路由已接入，但当前推理仍被 `torch` 缺失阻塞
 - 本地 FAISS 20-song 验证已完成
 - handoff / changelog / docs README 已同步
+
+- handoff 已刷新：yes（已指向 voice service runtime 当前状态与下一步排查路径）