zagens-cli 0.8.3

Zagens headless CLI + HTTP/SSE runtime sidecar (`zagens`, `zagens-runtime` binaries)
Documentation 
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use crate::models::{SystemBlock, SystemPrompt};

pub fn merge_system_prompts(
    original: Option<&SystemPrompt>,
    summary: Option<SystemPrompt>,
) -> Option<SystemPrompt> {
    match (original, summary) {
        (None, None) => None,
        (Some(orig), None) => Some(orig.clone()),
        (None, Some(sum)) => Some(sum),
        (Some(SystemPrompt::Text(orig_text)), Some(SystemPrompt::Blocks(mut sum_blocks))) => {
            // Prepend original system prompt
            sum_blocks.insert(
                0,
                SystemBlock {
                    block_type: "text".to_string(),
                    text: orig_text.clone(),
                    cache_control: None,
                },
            );
            Some(SystemPrompt::Blocks(sum_blocks))
        }
        (Some(SystemPrompt::Blocks(orig_blocks)), Some(SystemPrompt::Blocks(mut sum_blocks))) => {
            // Prepend original blocks
            for (i, block) in orig_blocks.iter().enumerate() {
                sum_blocks.insert(i, block.clone());
            }
            Some(SystemPrompt::Blocks(sum_blocks))
        }
        (Some(orig), Some(SystemPrompt::Text(sum_text))) => {
            let mut blocks = match orig {
                SystemPrompt::Text(t) => vec![SystemBlock {
                    block_type: "text".to_string(),
                    text: t.clone(),
                    cache_control: None,
                }],
                SystemPrompt::Blocks(b) => b.clone(),
            };
            blocks.push(SystemBlock {
                block_type: "text".to_string(),
                text: sum_text,
                cache_control: None,
            });
            Some(SystemPrompt::Blocks(blocks))
        }
    }
}