Agent Skills: error-management

This skill should be used when the user asks about "Effect errors", "typed errors", "error handling", "Effect.catchAll", "Effect.catchTag", "Effect.mapError", "Effect.orElse", "error accumulation", "defects vs errors", "expected errors", "unexpected errors", "sandboxing", "retrying", "timeout", "Effect.cause", "TaggedError", "Schema.TaggedError", or needs to understand how Effect handles failures in the error channel.