[codex] align routing release posture

[8Dionysus]

What changed

• align release guidance and generated routing surfaces with the current release posture
• keep README and generated router outputs in sync with the actual source-owned route inventory

Why

• this removes stale release-direction drift while the federation direction surfaces are being normalized

Validation

• python scripts/build_router.py --check
• python scripts/validate_router.py
• python scripts/build_two_stage_skill_router.py --check
• python scripts/validate_two_stage_skill_router.py
• git diff --check