fix(#829): enforce repository-wide runtime launch choke point

packages/mosaic/framework/tools/qa/remediation-hook-handler.sh

@@ -58,8 +58,8 @@ ACTIONS_PATH="$IN_PROGRESS_DIR/$ACTIONS_FILE"
 
 echo "[$(date '+%Y-%m-%d %H:%M:%S')] Starting remediation: $ACTIONS_PATH" | tee -a "$LOG_FILE"
 
-# Trigger remediation agent
-claude -p "Use Task tool to launch auto-remediation-agent for:
+# Trigger remediation agent through the authenticated lease-broker choke-point.
+python3 "$(dirname "$0")/../lease-broker/launch-runtime.py" --runtime claude -- claude -p "Use Task tool to launch auto-remediation-agent for:
 - Remediation Report: $IN_PROGRESS_DIR/$(basename "$REPORT_FILE")
 - Actions File: $ACTIONS_PATH
 - Max Iterations: 5