refactor(utils): move fingerprint module to utils namespace

BREAKING CHANGE: The Fingerprint module has been relocated from the
root namespace to the utils namespace. Update imports from
`crate::fingerprint` to `crate::utils::fingerprint`.

- Move fingerprint module from src/fingerprint.rs to src/utils/fingerprint.rs
- Update all import paths across the codebase to reflect new location
- Move other utility modules to consolidate utilities under utils/

Author: zTgx

src/index/incremental/detector.rs

@@ -14,7 +14,7 @@ use std::time::SystemTime;
 use serde::{Deserialize, Serialize};
 
 use crate::document::{DocumentTree, NodeId};
-use crate::fingerprint::{Fingerprint, Fingerprinter, NodeFingerprint};
+use crate::utils::fingerprint::{Fingerprint, Fingerprinter, NodeFingerprint};
 
 /// Type of change detected.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]

src/index/stages/build.rs

@@ -10,7 +10,7 @@ use tracing::info;
 use crate::document::{DocumentTree, NodeId};
 use crate::error::Result;
 use crate::parser::RawNode;
-use crate::util::estimate_tokens;
+use crate::utils::estimate_tokens;
 
 use super::{IndexStage, StageResult};
 use crate::index::ThinningConfig;

src/index/stages/enhance.rs

@@ -10,7 +10,7 @@ use tracing::{debug, info, warn};
 
 use crate::document::{DocumentTree, NodeId, TreeNode};
 use crate::error::Result;
-use crate::fingerprint::Fingerprint;
+use crate::utils::fingerprint::Fingerprint;
 use crate::llm::LlmClient;
 use crate::memo::{MemoKey, MemoStore, MemoValue};
 

src/index/summary/strategy.rs

@@ -6,7 +6,7 @@
 use async_trait::async_trait;
 
 use crate::document::{DocumentTree, NodeId};
-use crate::fingerprint::Fingerprint;
+use crate::utils::fingerprint::Fingerprint;
 use crate::llm::{LlmClient, LlmResult};
 use crate::memo::{MemoKey, MemoStore, MemoValue};
 

src/lib.rs

@@ -19,7 +19,7 @@ use tracing::{debug, info, warn};
 
 use super::types::{MemoEntry, MemoKey, MemoStats, MemoValue};
 use crate::error::Result;
-use crate::fingerprint::Fingerprint;
+use crate::utils::fingerprint::Fingerprint;
 
 /// Default TTL for cache entries (7 days).
 const DEFAULT_TTL: Duration = Duration::days(7);

src/memo/store.rs

@@ -6,7 +6,7 @@
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
-use crate::fingerprint::Fingerprint;
+use crate::utils::fingerprint::Fingerprint;
 
 /// Types of operations that can be memoized.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
@@ -141,7 +141,7 @@ impl MemoKey {
 
     /// Compute a fingerprint of this key for storage.
     pub fn fingerprint(&self) -> Fingerprint {
-        use crate::fingerprint::Fingerprinter;
+        use crate::utils::fingerprint::Fingerprinter;
 
         let mut fp = Fingerprinter::new();
         fp.write_u64(self.op_type.as_byte() as u64);

src/memo/types.rs

@@ -9,7 +9,7 @@ use std::path::Path;
 
 use crate::error::Result;
 use crate::parser::{DocumentFormat, DocumentMeta, DocumentParser, ParseResult, RawNode};
-use crate::util::estimate_tokens;
+use crate::utils::estimate_tokens;
 
 use super::config::HtmlConfig;
 

src/parser/html/parser.rs

@@ -9,7 +9,7 @@ use std::path::Path;
 
 use crate::error::Result;
 use crate::parser::{DocumentFormat, DocumentMeta, DocumentParser, ParseResult, RawNode};
-use crate::util::estimate_tokens;
+use crate::utils::estimate_tokens;
 
 use super::config::MarkdownConfig;
 use super::frontmatter;

src/parser/markdown/parser.rs

@@ -3,7 +3,7 @@
 
 //! PDF document types.
 
-use crate::util::estimate_tokens;
+use crate::utils::estimate_tokens;
 use serde::{Deserialize, Serialize};
 
 /// A single page from a PDF document.