Add explicit indexing timeout bounds and propagate timeout_seconds through the repo indexing service, utility walker, and CLI entrypoint so large repositories fail predictably instead of hanging.
Add 10K-scale Behave/Robot verification and a dedicated benchmark path to validate that large-project indexing completes, persists status correctly, and remains measurable for regressions.
Address review feedback by splitting oversized Behave and Robot support files into focused modules, trimming repo_indexing_service.py back under the 500-line limit, and rebasing the branch onto current master.
ISSUES CLOSED: #851
# Conflicts:
# CHANGELOG.md
# robot/helper_m5_e2e_verification.py
