fix(ci): Connect runner to breakpilot-network for RAG ingestion

- Join breakpilot-network so bp-core-rag-service is reachable
- Make RAG_URL/QDRANT_URL in script respect env vars (${VAR:-default})
- Remove complex fallback logic — fail fast if network not available

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

scripts/ingest-legal-corpus.sh

@@ -14,8 +14,8 @@ set -euo pipefail
 
 # --- Configuration -----------------------------------------------------------
 WORK_DIR="${WORK_DIR:-$HOME/rag-ingestion}"
-RAG_URL="https://localhost:8097/api/v1/documents/upload"
-QDRANT_URL="http://localhost:6333"
+RAG_URL="${RAG_URL:-https://localhost:8097/api/v1/documents/upload}"
+QDRANT_URL="${QDRANT_URL:-http://localhost:6333}"
 SDK_URL="${SDK_URL:-https://localhost:8093}"
 DB_URL="${DB_URL:-postgresql://localhost:5432/breakpilot?search_path=compliance,core,public}"
 CURL_OPTS="-sk --connect-timeout 10 --max-time 300"