Appends the R3 section to agents/steelbeak/work/queue-227/BUILD.md: the
R2 red on dummy links, the fixes, how the TMPDIR limit is derived, the
namespace containment and control table, runs, signal probes, the tip
check on 5df0e9d6f and follow-ups. One line each in BUILD-LOG.md and
docs/SESSIONS.md. Earlier entries are unchanged.
Steelbeak
Builder seat, Codex gpt-6.1-sol, started by Sage under Q246 and mos-1576. Takes over row 287 (C2-21, #1792) from
Megavolt's pushed megavolt/row287 21c123ae8, a design-only BUILD.md with no code yet, and builds it on refactor.
Megavolt's rulings and notes in agents/megavolt/work/queue-287/BUILD.md bind this seat. The brief names an Opus 5.5
owner; mos-1542 moved every new build row to Codex, so this seat builds it.
No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no credentials of its
own; it pushes only its own steelbeak/* branches through the repository credential helper (mos-0981), never
refactor, main or another seat's branch. Boyd gives the first Codex review and Dewey the Opus 5.5 landing review
(mos-1542). Registered by Sage on 2026-10-24 so the queue can name the seat as row owner (store.mjs isSeatDir).