feat: Add sal-net package to workspace

- Add new sal-net package to the workspace.
- Update MONOREPO_CONVERSION_PLAN.md to reflect the
  addition of the sal-net package and mark it as
  production-ready.
- Add Cargo.toml and README.md for the sal-net package.

net/tests/http_tests.rs

@@ -0,0 +1,219 @@
+use reqwest::StatusCode;
+use sal_net::HttpConnector;
+use std::time::Duration;
+
+#[tokio::test]
+async fn test_http_connector_new() {
+    let result = HttpConnector::new();
+    assert!(result.is_ok());
+}
+
+#[tokio::test]
+async fn test_http_connector_with_timeout() {
+    let timeout = Duration::from_secs(10);
+    let result = HttpConnector::with_timeout(timeout);
+    assert!(result.is_ok());
+}
+
+#[tokio::test]
+async fn test_http_connector_default() {
+    let connector = HttpConnector::default();
+
+    // Test that default connector actually works
+    let result = connector.check_url("https://httpbin.org/status/200").await;
+
+    // Should either work or fail gracefully (network dependent)
+    match result {
+        Ok(_) => {}  // Network request succeeded
+        Err(_) => {} // Network might not be available, that's ok
+    }
+}
+
+#[tokio::test]
+async fn test_check_url_valid() {
+    let connector = HttpConnector::new().unwrap();
+
+    // Use a reliable public URL
+    let result = connector.check_url("https://httpbin.org/status/200").await;
+
+    // Note: This test depends on external network, might fail in isolated environments
+    match result {
+        Ok(is_reachable) => {
+            // If we can reach the internet, it should be true
+            // If not, we just verify the function doesn't panic
+            println!("URL reachable: {}", is_reachable);
+        }
+        Err(e) => {
+            // Network might not be available, that's okay for testing
+            println!("Network error (expected in some environments): {}", e);
+        }
+    }
+}
+
+#[tokio::test]
+async fn test_check_url_invalid() {
+    let connector = HttpConnector::new().unwrap();
+
+    // Use an invalid URL format
+    let result = connector.check_url("not-a-valid-url").await;
+
+    assert!(result.is_err()); // Should fail due to invalid URL format
+}
+
+#[tokio::test]
+async fn test_check_url_unreachable() {
+    let connector = HttpConnector::new().unwrap();
+
+    // Use a URL that should not exist
+    let result = connector
+        .check_url("https://this-domain-definitely-does-not-exist-12345.com")
+        .await;
+
+    assert!(result.is_ok());
+    assert!(!result.unwrap()); // Should be unreachable
+}
+
+#[tokio::test]
+async fn test_check_status_valid() {
+    let connector = HttpConnector::new().unwrap();
+
+    // Use httpbin for reliable testing
+    let result = connector
+        .check_status("https://httpbin.org/status/200")
+        .await;
+
+    match result {
+        Ok(Some(status)) => {
+            assert_eq!(status, StatusCode::OK);
+        }
+        Ok(None) => {
+            // Network might not be available
+            println!("No status returned (network might not be available)");
+        }
+        Err(e) => {
+            // Network error, acceptable in test environments
+            println!("Network error: {}", e);
+        }
+    }
+}
+
+#[tokio::test]
+async fn test_check_status_404() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector
+        .check_status("https://httpbin.org/status/404")
+        .await;
+
+    match result {
+        Ok(Some(status)) => {
+            assert_eq!(status, StatusCode::NOT_FOUND);
+        }
+        Ok(None) => {
+            println!("No status returned (network might not be available)");
+        }
+        Err(e) => {
+            println!("Network error: {}", e);
+        }
+    }
+}
+
+#[tokio::test]
+async fn test_check_status_invalid_url() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector.check_status("not-a-valid-url").await;
+
+    assert!(result.is_err()); // Should fail due to invalid URL
+}
+
+#[tokio::test]
+async fn test_get_content_valid() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector.get_content("https://httpbin.org/json").await;
+
+    match result {
+        Ok(content) => {
+            assert!(!content.is_empty());
+            // httpbin.org/json returns JSON, so it should contain braces
+            assert!(content.contains("{") && content.contains("}"));
+        }
+        Err(e) => {
+            // Network might not be available
+            println!("Network error: {}", e);
+        }
+    }
+}
+
+#[tokio::test]
+async fn test_get_content_404() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector
+        .get_content("https://httpbin.org/status/404")
+        .await;
+
+    // Should fail because 404 is not a success status
+    assert!(result.is_err());
+}
+
+#[tokio::test]
+async fn test_get_content_invalid_url() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector.get_content("not-a-valid-url").await;
+
+    assert!(result.is_err()); // Should fail due to invalid URL
+}
+
+#[tokio::test]
+async fn test_verify_status_success() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector
+        .verify_status("https://httpbin.org/status/200", StatusCode::OK)
+        .await;
+
+    match result {
+        Ok(matches) => {
+            assert!(matches); // Should match 200 OK
+        }
+        Err(e) => {
+            println!("Network error: {}", e);
+        }
+    }
+}
+
+#[tokio::test]
+async fn test_verify_status_mismatch() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector
+        .verify_status("https://httpbin.org/status/200", StatusCode::NOT_FOUND)
+        .await;
+
+    match result {
+        Ok(matches) => {
+            assert!(!matches); // Should not match (200 != 404)
+        }
+        Err(e) => {
+            println!("Network error: {}", e);
+        }
+    }
+}
+
+#[tokio::test]
+async fn test_verify_status_unreachable() {
+    let connector = HttpConnector::new().unwrap();
+
+    let result = connector
+        .verify_status(
+            "https://this-domain-definitely-does-not-exist-12345.com",
+            StatusCode::OK,
+        )
+        .await;
+
+    assert!(result.is_ok());
+    assert!(!result.unwrap()); // Should not match because URL is unreachable
+}