ci: AUT-2161 route external jobs through ephemeral v2

[svcnemo-autobot]

Background

RL uses NON_NVIDIA_H100_RUNNER for external H100 jobs. AUT-2161 requires shared feature-flagged routing.

What changed

• pin the resolver and H100 preflight to v1.9.0
• resolve the external label from NON_NVIDIA_H100_RUNNER
• preserve DEFAULT_H100_RUNNER for members and legacy fallback when unset

Details

flowchart LR
  V[Lane variable] --> R[Shared resolver]
  H[Legacy H100 variable] --> R
  R --> P[External H100 preflight]
  M[Member H100 runner] --> P

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Tested

Static assertions verified the RL-specific legacy source, immutable pin, dynamic output, and unchanged member input. GitHub CI remains authoritative.

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[svcnvidia-nemo-ci]

/ok to test d71dcdb