fix(ai): stop over-truncating agent run reason labels - #1186
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The reason label carries the model's reasoning — the readable core of the run timeline, not a truncated excerpt like args/result — but it was capped at 600 chars, cutting reasoning mid-sentence in the UI. Raise maxStepLabelLen to 8000 (args/result unchanged) and make truncateStepText rune-safe so multibyte UTF-8 is never cut mid-character. MOG-4550 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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The reason label carries the model's reasoning — the readable core of the run timeline, not a truncated excerpt like args/result — but it was capped at 600 chars, cutting reasoning mid-sentence in the UI. Raise maxStepLabelLen to 8000 (args/result unchanged) and make truncateStepText rune-safe so multibyte UTF-8 is never cut mid-character.
MOG-4550