Documentation: Update Hello World tutorial prerequisites for Swift 6.2.1

Author: kateinoigakukun

Sources/JavaScriptKit/Documentation.docc/Tutorials/Hello-World/Hello-World.tutorial

@@ -6,19 +6,35 @@
   }
 
   @Section(title: "Prerequisites") {
-    Visit the [installation guide](https://book.swiftwasm.org/getting-started/setup.html) to install the Swift SDK for WebAssembly before starting this tutorial.
-    This tutorial assumes you have the Swift SDK for WebAssembly installed. Please check your Swift installation.
+    This tutorial requires the OSS Swift Toolchain and Swift SDK for WebAssembly to be installed. Follow these steps to set up your development environment for building web applications with JavaScriptKit.
 
     @Steps {
       @Step {
-        Check your Swift toolchain version. If you see different 
-        @Code(name: "Console", file: "hello-world-0-1-swift-version.txt")
+        Install `swiftly`, the Swift toolchain installer, per the [instructions on swift.org](https://www.swift.org/install/) for your platform.
+
+        `swiftly` is the recommended way to install and manage OSS Swift toolchains. You cannot use toolchains bundled with Xcode for WebAssembly development.
+        @Code(name: "Console", file: "hello-world-0-0-install-swiftly.txt")
+      }
+
+      @Step {
+        Install the latest Swift 6.2 development snapshot using `swiftly`:
+
+        @Code(name: "Console", file: "hello-world-0-1-install-toolchain.txt")
       }
+
+      @Step {
+        Install the Swift SDK for WASI that matches your toolchain version:
+
+        Navigate to [the downloads page](https://www.swift.org/download/) and find the "Swift SDK for WASI" section. Find a version that **exactly** matches the toolchain version from step 2.
+
+        @Code(name: "Console", file: "hello-world-0-2-install-sdk.txt")
+      }
+
       @Step {
-        Select a Swift SDK for WebAssembly version that matches the version of the Swift toolchain you have installed.
+        Verify the Swift SDK installation and set up your environment:
 
         The following sections of this tutorial assume you have set the `SWIFT_SDK_ID` environment variable.
-        @Code(name: "Console", file: "hello-world-0-2-select-sdk.txt")
+        @Code(name: "Console", file: "hello-world-0-3-verify-sdk.txt")
       }
     }
   }
@@ -98,4 +114,4 @@
       }
     }
   }
-} 
+}

Sources/JavaScriptKit/Documentation.docc/Tutorials/Hello-World/Resources/hello-world-0-0-install-swiftly.txt

@@ -0,0 +1,9 @@
+# Install swiftly per the instructions for your platform
+# Visit https://www.swift.org/install/ for platform-specific instructions
+
+# Example for macOS:
+$ curl -O https://download.swift.org/swiftly/darwin/swiftly.pkg && \
+installer -pkg swiftly.pkg -target CurrentUserHomeDirectory && \
+~/.swiftly/bin/swiftly init --quiet-shell-followup && \
+. "${SWIFTLY_HOME_DIR:-$HOME/.swiftly}/env.sh" && \
+hash -r

Sources/JavaScriptKit/Documentation.docc/Tutorials/Hello-World/Resources/hello-world-0-1-install-toolchain.txt

@@ -0,0 +1,14 @@
+# Install latest 6.2 development snapshot
+$ swiftly install 6.2.1
+Installing Swift 6.2.1...
+Swift 6.2.1 installed successfully.
+
+# Select the installed toolchain
+$ swiftly use 6.2.1
+Using Swift 6.2.1
+
+# Verify the toolchain is active
+$ swift --version
+Apple Swift version 6.2.1 (swift-6.2.1-RELEASE)
+or
+Swift version 6.2.1 (swift-6.2.1-RELEASE)

Sources/JavaScriptKit/Documentation.docc/Tutorials/Hello-World/Resources/hello-world-0-1-swift-version.txt

@@ -0,0 +1,6 @@
+# Navigate to https://www.swift.org/download/ and find the "Swift SDK for WASI" section
+# Find a URL that exactly matches your toolchain version from the previous step
+# Press "Copy install command" to get the installation command
+
+# Example installation command (replace with the exact command from swift.org):
+$ swift sdk install https://download.swift.org/swift-6.2.1-release/wasm-sdk/swift-6.2.1-RELEASE/swift-6.2.1-RELEASE_wasm.artifactbundle.tar.gz --checksum 482b9f95462b87bedfafca94a092cf9ec4496671ca13b43745097122d20f18af

Sources/JavaScriptKit/Documentation.docc/Tutorials/Hello-World/Resources/hello-world-0-2-install-sdk.txt

@@ -0,0 +1,8 @@
+# Verify the Swift SDK was installed
+$ swift sdk list
+swift-6.2.1-RELEASE_wasm
+swift-6.2.1-RELEASE_wasm-embedded
+
+# In this tutorial, we use non-embedded SDK.
+# Set the SDK ID as an environment variable for convenience
+$ export SWIFT_SDK_ID=swift-6.2.1-RELEASE_wasm

Sources/JavaScriptKit/Documentation.docc/Tutorials/Hello-World/Resources/hello-world-0-2-select-sdk.txt

@@ -5,5 +5,5 @@ Creating .gitignore
 Creating Sources/
 Creating Sources/main.swift
 
-$ swift package add-dependency https://github.com/swiftwasm/JavaScriptKit.git --branch main
+$ swift package add-dependency https://github.com/swiftwasm/JavaScriptKit.git --from 0.36.0
 Updating package manifest at Package.swift... done.

Sources/JavaScriptKit/Documentation.docc/Tutorials/Hello-World/Resources/hello-world-0-3-verify-sdk.txt

@@ -5,7 +5,7 @@ Creating .gitignore
 Creating Sources/
 Creating Sources/main.swift
 
-$ swift package add-dependency https://github.com/swiftwasm/JavaScriptKit.git --branch main
+$ swift package add-dependency https://github.com/swiftwasm/JavaScriptKit.git --from 0.36.0
 Updating package manifest at Package.swift... done.
 
 $ swift package add-target-dependency --package JavaScriptKit JavaScriptKit Hello