Function isClaudeAssistantTextEvent

Type guard for Claude assistant message events containing non-empty text.

This is a compound guard that narrows to ClaudeAssistantTimelineEvent AND verifies the message contains at least one text block with non-whitespace content. Replaces the common pattern:

if (event.kind === "claude_protocol" && event.eventType === "assistant") {
  if (event.data.message.content.some((b) => b.type === "text" && b.text.trim().length > 0)) {
    // ...
  }
}
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