Tier 2 wrote 23 working scripts to scripts/tier2/ during the
send_result_to_send_20260616 track. These were scaffolding for the
rename work, not part of the codebase.
Move them to scripts/tier2/artifacts/ so the base scripts/tier2/
directory stays clean (it should only contain the production code:
failcount.py, run_track.py, write_report.py, setup_tier2_clone.ps1,
run_tier2_sandboxed.ps1, fetch_tier2_branch.ps1).
Per user feedback 2026-06-17: throw-away scripts are kept (for
archival) but live in a dedicated subdir, not in the production
namespace.
