Use direct Claude CLI download with error handling and monthly cache

- Download Claude CLI directly from GCS bucket instead of install script
- Add $ErrorActionPreference = 'Stop' to fail on first error
- Create .local/bin directory before download
- Change timestamp cache invalidation from weekly to monthly
- Remove TimestampComponent dependency from ClaudeComponent

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: gfraiteur

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

@@ -45,20 +45,27 @@ public override void WriteDockerfile( TextWriter writer )
 
             """ );
 
-        // Build a single multi-line RUN command for all operations
         writer.WriteLine(
-                """
-                RUN irm https://claude.ai/install.ps1 | iex; `
-                    $claudeJsonPath = 'C:\Users\ContainerAdministrator\.claude.json'; `
-                    if (Test-Path $claudeJsonPath) { `
-                        $claudeConfig = Get-Content $claudeJsonPath -Raw | ConvertFrom-Json; `
-                        $claudeConfig | Add-Member -NotePropertyName 'hasCompletedOnboarding' -NotePropertyValue $true -Force; `
-                        $claudeConfig | ConvertTo-Json -Depth 10 | Set-Content $claudeJsonPath; `
-                    } else { `
-                        '{"hasCompletedOnboarding": true}' | Set-Content $claudeJsonPath; `
-                    }; `
-                """ );
-        // Add marketplaces if any are specified
+            """
+            RUN $ErrorActionPreference = 'Stop'; `
+                $version = '2.1.27'; `
+                $url = \"https://storage.googleapis.com/claude-code-dist-86c565f3-f756-42ad-8dfa-d59b1c096819/claude-code-releases/2.1.27/win32-x64/claude.exe\"; `
+                New-Item -ItemType Directory -Path \"$env:USERPROFILE\.local\bin\" -Force | Out-Null; `
+                echo \"Downloading Claude CLI from $url...\"; `
+                Invoke-WebRequest -Uri $url -OutFile \"$env:USERPROFILE\.local\bin\claude.exe\"; `
+                echo 'Claude CLI $version installed.'; `
+                echo \"Configuring Claude CLI...\"; `
+                if (Test-Path $claudeJsonPath) { `
+                    $claudeConfig = Get-Content $claudeJsonPath -Raw | ConvertFrom-Json; `
+                    $claudeConfig | Add-Member -NotePropertyName 'hasCompletedOnboarding' -NotePropertyValue $true -Force; `
+                    $claudeConfig | ConvertTo-Json -Depth 10 | Set-Content $claudeJsonPath; `
+                } else { `
+                    '{"hasCompletedOnboarding": true}' | Set-Content $claudeJsonPath; `
+                }; `
+                echo 'Configuring Claude CLI plugins.';`
+            
+            """ );
+
         foreach ( var marketplace in this.Marketplaces )
         {
             writer.WriteLine( $"    claude plugin marketplace add {marketplace}; `" );
@@ -70,7 +77,7 @@ public override void WriteDockerfile( TextWriter writer )
             writer.WriteLine( $"    claude plugin install {plugin}; `" );
         }
 
-        writer.WriteLine("  echo 'Claude CLI installation completed.'");
+        writer.WriteLine( $"    echo \"Claude $version installed\"" );
         writer.WriteLine();
     }
 
@@ -83,11 +90,5 @@ public override void AddRequirements( IReadOnlyList<ContainerComponent> componen
         {
             add( new GitHubCliComponent() );
         }
-
-        // Auto-add TimestampComponent for cache invalidation
-        if ( !components.OfType<TimestampComponent>().Any() )
-        {
-            add( new TimestampComponent() );
-        }
     }
 }

src/PostSharp.Engineering.BuildTools/Resources/DockerBuild.ps1

@@ -13,7 +13,7 @@ param(
     [switch]$NoMcp, # Do not start the MCP approval server (for -Claude mode).
     [switch]$Update, # Update timestamp to invalidate Docker cache and force Claude/plugin updates (Claude mode only).
     # Timestamp value for Docker cache invalidation. Increase this to force updates of unpinned components like Claude CLI.
-    # If not specified, defaults to the first day of the current week (so cache auto-invalidates weekly).
+    # If not specified, defaults to the first day of the current month (so cache auto-invalidates monthly).
     [string]$Timestamp,
     [string]$ImageName, # Image name (defaults to a name based on the directory).
     [string]$BuildAgentPath, # Path to build agent directory (defaults based on platform).
@@ -334,12 +334,10 @@ function New-TeamCityTimestampFile
 
     if ([string]::IsNullOrEmpty($TimestampValue))
     {
-        # Default to first day of current week (Monday) for weekly cache invalidation
+        # Default to first day of current month for monthly cache invalidation
         $today = [DateTime]::UtcNow.Date
-        $daysFromMonday = [int]$today.DayOfWeek - 1
-        if ($daysFromMonday -lt 0) { $daysFromMonday = 6 }  # Sunday = 6 days from Monday
-        $firstDayOfWeek = $today.AddDays(-$daysFromMonday)
-        $TimestampValue = $firstDayOfWeek.ToString("yyyy-MM-dd")
+        $firstDayOfMonth = [DateTime]::new($today.Year, $today.Month, 1)
+        $TimestampValue = $firstDayOfMonth.ToString("yyyy-MM-dd")
     }
 
     $gDirectory = Join-Path $DockerContextDir ".g"