v0.13.0

Changelog (v0.12.0...v0.13.0)

• bug #2465 Fix structured output arrays, CLI errors and stream deltas (@chr-hertel)
• feature #2450 Replay the assistant turn as the provider produced it (@chr-hertel)
• feature #2436 Agent to return a lazy Execution instance (@chr-hertel)
• feature #2431 Support template variables in file prompts (@mikemikimike)
• feature #2437 Add record-and-replay integration testing for bridges (@chr-hertel)
• bug #2432 Preserve result metadata and token usage in provider cassettes (@ousamabenyounes)
• feature #2382 Add CustomToolCallResult for custom_tool_call items (@valtzu)
• minor #2416 Mark ModelOptionsParser as internal (@wachterjohannes)
• bug #2404 Preserve periods in model option names (@saifulferoz)
• feature #2129 Add provider-level record/replay cassettes for test mocks (@wachterjohannes)
• feature #2128 HTTP-boundary record/replay cassettes for bridge tests (@wachterjohannes)
• feature #2363 Notify stream listeners on a mid-stream error via onError() (@ghisleouf)