feat: Add support for new OS package

- Add a new `sal-os` package containing OS interaction utilities.
- Update workspace members to include the new package.
- Add README and basic usage examples for the new package.

text/tests/text_replacement_tests.rs

@@ -1,13 +1,13 @@
 //! Unit tests for text replacement functionality
 //!
-//! These tests validate the TextReplacer and TextReplacerBuilder including:
+//! These tests validate the TextReplacer including:
 //! - Literal string replacement
 //! - Regex pattern replacement
 //! - Multiple chained replacements
 //! - File operations (read, write, in-place)
 //! - Error handling and edge cases
 
-use sal_text::{TextReplacer, TextReplacerBuilder};
+use sal_text::TextReplacer;
 use std::fs;
 use tempfile::NamedTempFile;
 
@@ -141,7 +141,7 @@ fn test_text_replacer_no_matches() {
 #[test]
 fn test_text_replacer_file_operations() {
     // Create a temporary file with test content
-    let mut temp_file = NamedTempFile::new().expect("Failed to create temp file");
+    let temp_file = NamedTempFile::new().expect("Failed to create temp file");
     let test_content = "Hello world, there are 123 items";
     fs::write(temp_file.path(), test_content).expect("Failed to write to temp file");
 
@@ -157,18 +157,21 @@ fn test_text_replacer_file_operations() {
         .expect("Failed to build replacer");
 
     // Test replace_file
-    let result = replacer.replace_file(temp_file.path()).expect("Failed to replace file content");
+    let result = replacer
+        .replace_file(temp_file.path())
+        .expect("Failed to replace file content");
     assert_eq!(result, "Hello universe, there are NUMBER items");
 
     // Verify original file is unchanged
-    let original_content = fs::read_to_string(temp_file.path()).expect("Failed to read original file");
+    let original_content =
+        fs::read_to_string(temp_file.path()).expect("Failed to read original file");
     assert_eq!(original_content, test_content);
 }
 
 #[test]
 fn test_text_replacer_file_in_place() {
     // Create a temporary file with test content
-    let mut temp_file = NamedTempFile::new().expect("Failed to create temp file");
+    let temp_file = NamedTempFile::new().expect("Failed to create temp file");
     let test_content = "Hello world, there are 123 items";
     fs::write(temp_file.path(), test_content).expect("Failed to write to temp file");
 
@@ -180,7 +183,9 @@ fn test_text_replacer_file_in_place() {
         .expect("Failed to build replacer");
 
     // Test replace_file_in_place
-    replacer.replace_file_in_place(temp_file.path()).expect("Failed to replace file in place");
+    replacer
+        .replace_file_in_place(temp_file.path())
+        .expect("Failed to replace file in place");
 
     // Verify file content was changed
     let new_content = fs::read_to_string(temp_file.path()).expect("Failed to read modified file");
@@ -190,7 +195,7 @@ fn test_text_replacer_file_in_place() {
 #[test]
 fn test_text_replacer_file_to_file() {
     // Create source file
-    let mut source_file = NamedTempFile::new().expect("Failed to create source file");
+    let source_file = NamedTempFile::new().expect("Failed to create source file");
     let test_content = "Hello world, there are 123 items";
     fs::write(source_file.path(), test_content).expect("Failed to write to source file");
 
@@ -205,11 +210,13 @@ fn test_text_replacer_file_to_file() {
         .expect("Failed to build replacer");
 
     // Test replace_file_to
-    replacer.replace_file_to(source_file.path(), dest_file.path())
+    replacer
+        .replace_file_to(source_file.path(), dest_file.path())
         .expect("Failed to replace file to destination");
 
     // Verify source file is unchanged
-    let source_content = fs::read_to_string(source_file.path()).expect("Failed to read source file");
+    let source_content =
+        fs::read_to_string(source_file.path()).expect("Failed to read source file");
     assert_eq!(source_content, test_content);
 
     // Verify destination file has replaced content
@@ -263,9 +270,10 @@ fn test_text_replacer_multiline_text() {
         .build()
         .expect("Failed to build replacer");
 
-    let input = "function test() {\n    // This is a comment\n    return true;\n    // Another comment\n}";
+    let input =
+        "function test() {\n    // This is a comment\n    return true;\n    // Another comment\n}";
     let result = replacer.replace(input);
-    
+
     // Note: This test depends on how the regex engine handles multiline mode
     // The actual behavior might need adjustment based on regex flags
     assert!(result.contains("function test()"));
@@ -288,7 +296,7 @@ fn test_text_replacer_unicode_text() {
 #[test]
 fn test_text_replacer_large_text() {
     let large_text = "word ".repeat(10000);
-    
+
     let replacer = TextReplacer::builder()
         .pattern("word")
         .replacement("term")