Black-hole the `/mirrors/*` repositories at the Fly proxy edge (`return 403` → `forge.ops.eblu.me`). A surprise $29.60 Fly bill traced to ~1.24 TB/30d of egress on `forge.eblu.me`, 99.95% of all proxy egress — of which ~71% was AI scrapers (Meta `meta-externalagent`, OpenAI `GPTBot`, Amazonbot) crawling the near-infinite git-history URL space of the public mirror repos and timing out Forgejo in the process. Mirrors exist for supply-chain control and are consumed over the tailnet, so their public web UI had no legitimate audience. `robots.txt` already disallowed `/mirrors/`, but the offending agents ignore it. Tier-2 mitigations (user-agent denylist, Anubis proof-of-work gateway) are documented in `docs/explanation/ai-scraper-mitigation.md`.