fix(one line fix): use max output size for compaction budget

[qkunio]

Related Issue

Resolve #476

Problem

/compact 会走一条单独的 provider 请求路径。#365 已经让普通对话使用模型配置里的 max_output_size 作为 completion token cap，但 compaction 路径里仍然只把 reservedContextSize 传给 resolveCompletionBudget。

这会让 OpenAI-compatible provider 在 compaction 时把模型的 context size 当成 output token cap 发送，最终触发 APIContextOverflowError。

What changed

代码只增加一行，解决报错。

在 compaction 的 completion budget 解析里传入 this.agent.config.maxOutputSize，让 /compact 优先使用模型配置的输出上限。

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

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