chore: release main#424

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Commits on Jun 22, 2026

feat(harness): unified harness surface — foundation (span derivation, delivery adapters, emitter) (#412)
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feat(streaming): stream tool call argument deltas in TemporalStreamingModel (#355)

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fix(harness): assert cross-channel (yield vs auto-send) conformance equivalence [AGX1-373] (#414)
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feat(pydantic-ai): migrate onto unified harness surface (PR4) (#415)
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feat(openai-agents): migrate onto the unified harness surface (#416)
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feat(claude-code): stream-json parser tap for the unified harness surface (#420)
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feat(langgraph): migrate LangGraph harness onto unified surface (#417)
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feat(codex): event-stream parser tap for the unified harness surface (#421)
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Commits on Jun 23, 2026