refactor(core): eagerly validate `trim_messages` arguments#34585

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Aman071106 wants to merge 3 commits intolangchain-ai:masterfrom

Aman071106:fix/trim-messages-eager-validation

Commits on Jan 2, 2026

core: refactor trim_messages to validate arguments eagerlyclea
Aman071106
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Commits on Jan 6, 2026