fix: eliminate piped while loops in token optimizer workflows (#24354)

Replace find | head -1 | while read piped pattern with command
substitution in copilot-token-optimizer and claude-token-optimizer
to avoid potential SIGPIPE under set -euo pipefail.

Also fix claude-token-usage-analyzer jq line to match copilot variant:
use []?.databaseId (optional object access) with 2>/dev/null || true.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lpcox

.github/workflows/claude-token-optimizer.lock.yml

@@ -163,10 +163,11 @@ steps:
         echo "Found workflow source: $WORKFLOW_MD"
         cp "$WORKFLOW_MD" /tmp/token-optimizer-claude/workflow-source.md
       else
-        find .github/workflows -name "*.md" -exec grep -l "^name: $WORKFLOW_NAME" {} \; 2>/dev/null | head -1 | while read -r f; do
-          echo "Found: $f"
-          cp "$f" /tmp/token-optimizer-claude/workflow-source.md
-        done
+        FOUND_MD=$(find .github/workflows -name "*.md" -exec grep -l "^name: $WORKFLOW_NAME" {} \; 2>/dev/null | head -1 || true)
+        if [ -n "$FOUND_MD" ]; then
+          echo "Found: $FOUND_MD"
+          cp "$FOUND_MD" /tmp/token-optimizer-claude/workflow-source.md
+        fi
       fi
 
       # Extract declared tools from workflow source