Add `Round` abstraction over `Turn` history#1056

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feat/507-rounds

Commits on Jul 9, 2026

feat: introduce Round abstraction over Turn history
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style: use assignment operator in test-provider-google
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refactor: fold system turns into Rounds; exclude partial turns from complete
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feat: add Round print and contents_* methods
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refactor: share turns_markdown() helper between Chat and Round
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fix: last_round() keeps system turns; document broader Round@input contract
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fix: document Round's complete property in prose, not @param
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