[mirror PRTS-90] ACP adapter 不上报 token usage

[Jetiaime]

Mirror of Multica issue PRTS-90 (workspace tracking).

Kimi Code ACP adapter does not report token usage (PromptResponse.usage empty).

• Upstream issue: ACP adapter does not report token usage (PromptResponse.usage empty, no usage_update emitted) MoonshotAI/kimi-code#1855
• Fix PR: fix(acp): report token usage on PromptResponse MoonshotAI/kimi-code#1858 (branch feat/acp-report-turn-usage on this fork)
• Related root-cause issue: ACP adapter does not surface failed turns (non-auth failures resolve as end_turn, error only in session log) MoonshotAI/kimi-code#1865

This fork issue exists to keep the Multica project (referencing this fork) in sync with GitHub. State mirrors PRTS-90.