Fix stale retry log messages

The echo said "Clearing staging/install" but build/install is
intentionally preserved to avoid disrupting concurrent test jobs.

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

Author: sbryngelson

.github/workflows/frontier/build.sh

@@ -48,7 +48,7 @@ while [ $attempt -le $max_attempts ]; do
     fi
 
     if [ $attempt -lt $max_attempts ]; then
-        echo "Build failed on attempt $attempt. Clearing staging/install and retrying in 30s..."
+        echo "Build failed on attempt $attempt. Clearing staging and retrying in 30s..."
         rm -rf build/staging build/lock.yaml
         sleep 30
     fi

.github/workflows/frontier_amd/build.sh

@@ -48,7 +48,7 @@ while [ $attempt -le $max_attempts ]; do
     fi
 
     if [ $attempt -lt $max_attempts ]; then
-        echo "Build failed on attempt $attempt. Clearing staging/install and retrying in 30s..."
+        echo "Build failed on attempt $attempt. Clearing staging and retrying in 30s..."
         rm -rf build/staging build/lock.yaml
         sleep 30
     fi

.github/workflows/phoenix/test.sh

@@ -23,7 +23,7 @@ while [ $attempt -le $max_attempts ]; do
     fi
 
     if [ $attempt -lt $max_attempts ]; then
-        echo "Build failed on attempt $attempt. Clearing staging/install and retrying in 30s..."
+        echo "Build failed on attempt $attempt. Clearing staging and retrying in 30s..."
         rm -rf build/staging build/lock.yaml
         sleep 30
     else