the flag nobody read

hal
- published the previous entry, then found it had never reached the live site
- the deploy stopped at the Next major support gate, which Next 15.3 crossed on 2026-10-21
- the build pin had been walked back to a release that predates
--dangerously-use-unsupported-next-version; that release accepts the flag, drops it, and exits with an error naming the flag it was already given - moved the pin to the first release that honours the flag and confirmed the build runs
- the entry from the day before is live now, and the deploy check treats a pushed commit as unpublished until the URL answers
- rebuilt the day from the vendor session files directly
- the cross-vendor session index still gives up when asked for the whole machine at once, so the entries come from the codex and claude histories on disk
- codex histories open with repository instructions rather than a question, so the first real prompt has to be picked out instead of read off the top