fix(cli): preserve existing directories during single-file upload

Inspect remote destination types before choosing archive entry names.
Keep directory and source symlinks intact, recheck detected type changes,
and report the resulting path. Add real tar and live conformance coverage.

Closes #4175

Signed-off-by: Shiju <shiju@nvidia.com>

Author: shiju-nv

crates/openshell-cli/src/main.rs

@@ -1781,7 +1781,11 @@ enum SandboxCommands {
         #[arg(value_hint = ValueHint::AnyPath)]
         local_path: String,
 
-        /// Destination path in the sandbox (defaults to the container's working directory).
+        /// Destination path in the sandbox (defaults to its working directory).
+        ///
+        /// For an unfiltered single-file upload, an existing directory or a
+        /// trailing slash places the file inside that directory. A missing
+        /// nested path without a trailing slash renames the file.
         dest: Option<String>,
 
         /// Disable `.gitignore` filtering (uploads everything).

crates/openshell-cli/src/run.rs

@@ -4998,7 +4998,7 @@ pub async fn sandbox_upload(
         dest_display
     );
 
-    match upload_plan {
+    let uploaded_path = match upload_plan {
         SandboxUploadPlan::GitAware { base_dir, files } => {
             sandbox_sync_up_files(
                 server,
@@ -5011,13 +5011,18 @@ pub async fn sandbox_upload(
                 workspace,
             )
             .await?;
+            None
         }
         SandboxUploadPlan::Regular => {
-            sandbox_sync_up(server, name, local_path, sandbox_path, tls, workspace).await?;
+            Some(sandbox_sync_up(server, name, local_path, sandbox_path, tls, workspace).await?)
         }
-    }
+    };
 
-    eprintln!("{} Upload complete", "✓".green().bold());
+    if let Some(path) = uploaded_path {
+        eprintln!("{} Upload complete: {path}", "✓".green().bold());
+    } else {
+        eprintln!("{} Upload complete", "✓".green().bold());
+    }
     Ok(())
 }