Python: Fix `_add_text_reasoning_content` to preserve `id` during coalescing#4862

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Commits on Mar 23, 2026

Fix _add_text_reasoning_content dropping id during coalescing (#4852)

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Python: Fix `_add_text_reasoning_content` to preserve `id` during coalescing
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Raise AdditionItemMismatch on conflicting text_reasoning ids (#4852)

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Address review feedback for #4852: Python: [Bug]: Content._add_text_reasoning_content drops id during coalescing, breaking encrypted reasoning round-trip
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