VoltAgent/voltagent @voltagent/core@2.6.4

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Patch Changes

• #1131 9a3ff6b Thanks @omeraplak! - fix(core): persist reasoning and tool parts across step checkpoint flushes (#1130)

  When conversationPersistence.mode = "step" was used with tool calls, some checkpoint flows could
  persist incomplete assistant messages and lose non-text parts in stored conversation history.

  This update preserves complete assistant message parts during checkpoint merges and persistence
  flushes, including reasoning, tool-call, tool-result, and text parts.

  Regression coverage is expanded with end-to-end agent persistence tests against both LibSQL and
  PostgreSQL backends to reduce the chance of similar regressions.

• #1123 13f4f40 Thanks @omeraplak! - fix: prevent duplicate assistant message persistence during step checkpoints (#1121)

  When conversationPersistence.mode = "step" flushed around tool results, the same assistant
  response could be persisted multiple times with different message_id values. This created
  duplicate assistant rows in memory and could surface downstream provider errors like duplicate
  OpenAI reasoning item ids.

  This update keeps a stable assistant response message id across step checkpoints and skips duplicate
  step response payloads before buffering, so intermediate checkpoint flushes update the same memory
  message instead of inserting new duplicates.