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* Share assistant payload replay matching * fix(provider): recover assistant field when ordinal AI index is taken The mismatch-length fallback in `_match_ai_message` only tried the exact `fallback_ordinal` AI index. When serialization drops or reorders an assistant message, a unique signature match can consume a non-ordinal index, leaving a later ambiguous payload's ordinal already used — so its provider field (e.g. `reasoning_content`) was silently dropped. Scan forward from the ordinal for the next unused `AIMessage` (wrapping to earlier indices) to preserve the positional bias while still recovering the field. Forward scanning avoids a naive min-unused pick that could restore the wrong field after a leading message is dropped. Add a regression test for the dropped-leading-message case. * fix(provider): avoid earlier assistant fallback replay