Initial AGENTS.md for the Codex-first coding discipline pilot.
Ratatoskr is the chosen pilot repo per operator decision 2026-05-29.
Defines: codex session's althing handle (ratatoskr-codex), reviewer
handle (ratatoskr-dev), branch + PR conventions, write-window
handshake protocol per discipline spec §7, attribution discipline,
out-of-scope files, and bootstrap protocol.
Depends on: brokkr-smithy/docs/codex-first-discipline.md v0.1
(brokkr-smithy commit 5dd061c, tag v0.5.3), corviduo-project-template/
docs/althing-monitoring.md (template commit 80e35d2) for inbound
transport canonical.
No version bump — convention/config-shape edit with no runtime effect.
