refactor(bare): enhance security and performance optimizations

- Remove unnecessary sorting in advertise_refs for deterministic output
- Add path traversal detection and validation in bare_dir construction
- Implement symlink resolution checks to prevent security vulnerabilities
- Refactor cache system with CRC validation and improved metrics
- Integrate repo-specific cache invalidation using indexed keys
- Add comprehensive unit tests for commit operations and diff functionality
- Move configuration constants to centralized config module
- Optimize string operations in disk cache random value generation
- Enhance license detection algorithm with cleaner matching logic
- Streamline argument processing in various git operations
- Update dependencies including crc32fast and flate2 for performance
- Add signal handling capability to tokio runtime configuration

remote/find_remote.rs

@@ -46,9 +46,6 @@ pub fn find_remote_repository(
             continue;
         }
 
-        // Lines can be:
-        // SHA<TAB>refname           (direct ref)
-        // ref: refs/heads/main<TAB>HEAD  (symbolic ref via --symref)
         if line.starts_with("ref:") {
             if let Some((target, name)) = line.split_once('\t') {
                 refs.push(RemoteHead {

remote/mirror.rs

@@ -103,7 +103,6 @@ impl GitBare {
             });
         }
 
-        // Update local HEAD to match remote HEAD
         let head_output = std::process::Command::new("git")
             .args([
                 "--git-dir",