Proving headline-plus-tool-line composition needs assistant text emitted
*before* a tool call: that leading text is what gets tagged as commentary and
rendered as the draft's status headline. The mock could only echo a single token,
so the draft path was unreachable without a live model.
Trigger `OPENCLAW_E2E_DRAFTPROOF` now serves two turns — preamble plus a shell
call, then the final answer — on both /v1/responses and /v1/chat/completions.
Only the completions transport tags commentary today, which is why the
completions path matters here.
Used to record the draft live on real Telegram: one message carrying the
headline above the tool line, the final answer, then the draft edited to its
receipt.
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