Indexing and Reference Systems

impl RefIndex {
    // Find all nodes that reference a specific document
    pub fn get_block_references_to(&self, key: &Key) -> Vec<NodeId>
    
    // Find all inline references (links) to a document  
    pub fn get_inline_references_to(&self, key: &Key) -> Vec<NodeId>
    
    // Recursively index a node and all its children
    pub fn index_node(&mut self, graph: &Graph, node_id: NodeId)
}

pub struct SearchPath {
    pub search_text: String,    // Concatenated plain text for matching
    pub node_rank: usize,      // Importance ranking
    pub key: Key,              // Source document
    pub root: bool,            // Is document root
    pub line: u32,             // Line number in source
    pub path: NodePath,        // Complete navigation path
}