ClaudeComponent: install latest version instead of hardcoded, with daily cache invalidation

Move Claude after the timestamp layer so Docker cache busts daily,
use @latest npm tag, and auto-require TimestampComponent.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: PostSharpAgent

eng/docker/Dockerfile.claude

@@ -72,14 +72,20 @@ ENV NPM_CONFIG_PREFIX=C:\npm
 ENV PATH="C:\nodejs;C:\npm;${PATH}"
 
 
+# Timestamp
+# Cache invalidation layer - changes when -Update is used
+COPY .g/update.timestamp C:\docker-context\update.timestamp
+RUN Write-Host "PostSharp.Engineering build timestamp: $(Get-Content C:\docker-context\update.timestamp)"
+
+
 # Install Claude CLI
 # Set HOME/USERPROFILE so Claude CLI finds credentials during build
 ENV HOME=C:\\Users\\ContainerAdministrator
 ENV USERPROFILE=C:\\Users\\ContainerAdministrator
 
 # Install Claude CLI and configure using cmd shell to avoid HCS issues with PowerShell
 SHELL ["cmd", "/S", "/C"]
-RUN C:\nodejs\npm.cmd install --global @anthropic-ai/claude-code@2.1.81
+RUN C:\nodejs\npm.cmd install --global @anthropic-ai/claude-code@latest
 RUN mkdir C:\Users\ContainerAdministrator\.claude && echo {"hasCompletedOnboarding": true} > C:\Users\ContainerAdministrator\.claude.json && echo {"alwaysThinkingEnabled": true, "spinnerTipsEnabled": false} > C:\Users\ContainerAdministrator\.claude\settings.json
 
 # Restore PowerShell shell using full path

eng/docker/Dockerfile.claude.win2022

@@ -72,14 +72,20 @@ ENV NPM_CONFIG_PREFIX=C:\npm
 ENV PATH="C:\nodejs;C:\npm;${PATH}"
 
 
+# Timestamp
+# Cache invalidation layer - changes when -Update is used
+COPY .g/update.timestamp C:\docker-context\update.timestamp
+RUN Write-Host "PostSharp.Engineering build timestamp: $(Get-Content C:\docker-context\update.timestamp)"
+
+
 # Install Claude CLI
 # Set HOME/USERPROFILE so Claude CLI finds credentials during build
 ENV HOME=C:\\Users\\ContainerAdministrator
 ENV USERPROFILE=C:\\Users\\ContainerAdministrator
 
 # Install Claude CLI and configure using cmd shell to avoid HCS issues with PowerShell
 SHELL ["cmd", "/S", "/C"]
-RUN C:\nodejs\npm.cmd install --global @anthropic-ai/claude-code@2.1.81
+RUN C:\nodejs\npm.cmd install --global @anthropic-ai/claude-code@latest
 RUN mkdir C:\Users\ContainerAdministrator\.claude && echo {"hasCompletedOnboarding": true} > C:\Users\ContainerAdministrator\.claude.json && echo {"alwaysThinkingEnabled": true, "spinnerTipsEnabled": false} > C:\Users\ContainerAdministrator\.claude\settings.json
 
 # Restore PowerShell shell using full path

src/PostSharp.Engineering.BuildTools/Docker/ClaudeComponent.cs

@@ -8,14 +8,12 @@
 namespace PostSharp.Engineering.BuildTools.Docker;
 
 /// <summary>
-/// Installs the Claude CLI. This component is placed before the timestamp for caching.
-/// Plugin installation is handled by <see cref="ClaudeAddInsComponent"/> which runs after the timestamp.
+/// Installs the Claude CLI. This component is placed after the timestamp so that the latest version
+/// is installed whenever the Docker image is rebuilt. Plugin installation is handled by <see cref="ClaudeAddInsComponent"/>.
 /// </summary>
 public class ClaudeComponent : ContainerComponent
 {
     private const string _minNodeVersion = "22.0.0";
-    private const string _claudeVersion = "2.1.81";
-
     public override string Name => "Install Claude CLI";
 
     public override ContainerComponentKind Kind => ContainerComponentKind.Claude;
@@ -36,7 +34,7 @@ public override void WriteDockerfile( TextWriter writer, ContainerOperatingSyste
             """ );
 
         // Build a single multi-line RUN command for all operations
-        writer.WriteLine( $"RUN C:\\nodejs\\npm.cmd install --global @anthropic-ai/claude-code@{_claudeVersion}" );
+        writer.WriteLine( "RUN C:\\nodejs\\npm.cmd install --global @anthropic-ai/claude-code@latest" );
         writer.Write( "RUN mkdir C:\\Users\\ContainerAdministrator\\.claude" );
         writer.Write( " && echo {\"hasCompletedOnboarding\": true} > C:\\Users\\ContainerAdministrator\\.claude.json" );
         writer.Write( " && echo {\"alwaysThinkingEnabled\": true, \"spinnerTipsEnabled\": false} > C:\\Users\\ContainerAdministrator\\.claude\\settings.json" );
@@ -66,6 +64,10 @@ public override void AddRequirements( IReadOnlyList<ContainerComponent> componen
             throw new InvalidOperationException( $"Claude CLI requires Node.js >= {_minNodeVersion}, but {existingNodeJs.Version} is configured." );
         }
 
-        // We don't add GitHub CLI because we don't have pass the token anyway.
+        // Require timestamp component for cache invalidation so @latest resolves on each daily build.
+        if ( !components.OfType<TimestampComponent>().Any() )
+        {
+            add( new TimestampComponent() );
+        }
     }
 }

src/PostSharp.Engineering.BuildTools/Docker/ContainerComponentKind.cs

@@ -19,8 +19,8 @@ public enum ContainerComponentKind
     GitHubCli,
     AzureCli,
     AzureArtifactsCredentialProvider,
-    Claude,
     Timestamp,
+    Claude,
     ClaudeAddIns,
     Epilogue
 }