feat: optional debug logging of fallback decisions#8
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When `debug: true`, the plugin writes a single-line `[model-fallback] ...` trace to stderr for every fallback decision: why a retry fired or was skipped (disabled, no fallback_models, not retryable, max_attempts reached, stale error, no available model, in-flight), the backoff delay, the actual switch, and recovery to the original model. Default off; no output otherwise. OpenCode surfaces plugin stderr in its log stream, so this is greppable without exposing a logger to plugins. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Проблема
Невозможно понять, почему fallback сработал или не сработал (не тот статус? исчерпаны попытки? cooldown? нет доступной модели?) — поддержка вслепую.
Решение
Новая опция
debug(по умолчаниюfalse). При включении плагин пишет однострочный трейс[model-fallback] …в stderr для каждого решения: причина срабатывания/пропуска (disabled / нет fallback_models / не ретраится / max_attempts / stale error / нет доступной модели / in-flight), задержка backoff, сам switch и recovery к исходной модели. По умолчанию выключено — нет вывода.OpenCode выводит stderr плагина в свой лог-поток, поэтому трейс грепается без необходимости экспортировать logger в плагины.
Тесты
debug: false→ stderr пуст.debug: true+ retry → лог содержит[model-fallback]иswitched to ….debug: true+ не-ретраимая ошибка → лог содержитnot retryable.Юнит-тесты 56/56, typecheck чист.
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