nginx proxy docs (bounded research)

Recorded occam research folder. Seed: https://nginx.org/en/docs/. Focus: proxy_pass proxy_read_timeout. Stop: budget_pages after two successful extracts. Off-site URL listed in discovery.outOfScope.

Host: ff-occam/1.0.0-rc.2 assembled from golden excerpts — not a GitHub Release v1.0.0 certification.

Replay from _inputs/nginx-proxy.json. Parent: site research.