Codex Herd compatibility entrypoint

Claude is the default Herd controller, planner, and general implementer. Codex
contributes UI/UX direction and bounded UI implementation, prose/voice, and
independent review. The Claude implementation worker retains task, commit, and
lifecycle ownership.

Read claude/skills/herdr-orchestration/SKILL.md in the same dotfiles checkout
for the canonical Claude-led workflow, and
claude/skills/herdr-orchestration/references/codex-ui-specialist.md for the
bounded specialist dispatch recipe. Resolve that source through this
installed skill rather than the user's project cwd:

SKILL_FILE="${CODEX_HOME:-$HOME/.codex}/skills/herdr-orchestration/SKILL.md"
SKILL_DIR="$(python3 -c 'from pathlib import Path; import sys; print(Path(sys.argv[1]).resolve(strict=True).parent)' "$SKILL_FILE")" || exit 2
ORCH_SOURCE_ROOT="$(cd "$SKILL_DIR/../../.." && pwd)"
SHARED_SKILL="$ORCH_SOURCE_ROOT/claude/skills/herdr-orchestration/SKILL.md"

For bounded implementation, accept only the assigned UI files and tests; return
a result to the Claude worker. Do not claim Herd ownership, commit, or emit a
lifecycle record. A fresh independent Claude review-change review
(development_reviewer: Sonnet/high) is required for Codex UI edits before the
Claude worker accepts them. This is task-local readiness; final co-review is
still required for a finished PR.

Normal standalone Codex CLI use remains the user's choice. Shared compatibility
APIs remain installed. A Codex-driven Herd controller is not supported and is not
a goal - Codex participates only as a bounded specialist (UX/UI, prose/voice,
independent review).