ci: AUT-2161 route external jobs through ephemeral v2

[svcnemo-autobot]

Background

External CI directly selects the static x2 ephemeral runner. AUT-2161 requires independently controlled v2 routing.

What changed

• pin the shared resolver and preflight to v1.9.0
• feed the resolver output to the external runner input
• preserve the regular x2 member runner and static fallback

Details

flowchart LR
  V[Lane variable] --> R[Shared resolver]
  R -->|unset| L[Legacy x2]
  R -->|ephemeral-v2| D[Dynamic x2 route]
  D --> P[External preflight]

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Tested

Static assertions verified the immutable pin, exact legacy label, dynamic output, and unchanged member label. GitHub CI remains authoritative.

[copy-pr-bot]

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[greptile-apps]

Greptile Summary

This PR routes external CI jobs through the pinned ephemeral-v2 resolver while retaining the legacy x2 label as its fallback.

• Adds a reusable ephemeral-runner routing job pinned to FW-CI-templates v1.9.0.
• Makes preflight consume the resolved runner label.
• Updates preflight to the same immutable v1.9.0 revision.

Confidence Score: 5/5

The PR appears safe to merge with no concrete blocking or non-blocking defects identified.

The workflow preserves the exact legacy external-runner label, pins both reusable workflows to one immutable revision, and wires the resolver output through an explicit dependency.

Important Files Changed

Filename	Overview
.github/workflows/cicd-main.yml	Adds pinned ephemeral-runner resolution and passes its selected label into the upgraded preflight workflow; no actionable defect was established.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  V[NEMO_CI_EPHEMERAL_LANE] --> R[Ephemeral runner resolver v1.9.0]
  L[Legacy x2 ephemeral label] --> R
  R -->|runner_label| P[Preflight v1.9.0]
  P --> E[External CI jobs]
  P --> M[Regular member CI jobs]

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_{Reviews (1): Last reviewed commit: "ci: route external jobs through ephemera..." | Re-trigger Greptile}

[svcnvidia-nemo-ci]

/ok to test 0993755