ci: route member builds to private Linux runners

[Quick104]

Problem

Related issue: Silo-Server/siloserver.org#55

Member PRs and main builds should use the private Linux runner pool.

Approach

Call the trusted reusable workflow on main. SILO_CI_MEMBERS selects member PRs for private routing; the controller independently verifies current organization membership and PR state before creating a disposable runner. Main builds use the same pool.

Validation

GOWORK=off go test ./..., GOWORK=off go vet ./..., GOWORK=off go build ./..., and actionlint passed. gofmt -l . produced no output. Reviewed run/attempt labels and the event/repository conditions against the controller admission rules.

Risks

Refresh SILO_CI_MEMBERS when organization membership changes. Private PR run 36660286463 passed in runner group 3; the runner registration and disposable VM were removed. Removed members fail live admission even if their routing entry is stale.

Checklist

• I read and can explain the complete diff.
• This pull request addresses one concern.

AI Disclosure

• Harness: Codex desktop.
• Tool(s): functions.exec with exec_command and apply_patch; unified-computer-use cua_repl.
• Model(s): GPT-6, as reported by the harness; a more specific deployment identifier is unavailable.
• Involvement: AI-assisted.
• Adversarial review: examined caller-controlled inputs, stale PR commits, organization membership, workflow references and credentials. The controller checks live membership and binds runners to individual runs and attempts. Seventeen admission tests passed; the current PR passed on the private runner with live admission.

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• .github/workflows/ci.yml

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-30T02:33:39.631988Z	f96fce4	PR opened

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