Keep tool calls in history, with placeholder results

History kept only what was said, so after a few factual answers the
model saw no tool behind them and invented the next one: asked for
pending updates it made up counts without calling the tool (1/10 on a
replayed session). Keeping each turn's tool calls brings it back to
10/10. Their results are replaced by a placeholder, which scores the
same and keeps the context close to what it was; a follow-up on an old
result calls the tool again. The window is now the last 10 whole turns.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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