YeonGyu-Kim 7c24f657e7 fix: include output tokens in context window usage calculation
Include output tokens from last response in getContextWindowUsage calculation.
Output tokens become part of next request's input (conversation history), so
they must be counted to avoid overestimating remainingTokens. This aligns with
preemptive-compaction's calculation which already includes output tokens correctly.

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2025-12-26 16:11:21 +09:00
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