CI jobs fail before runner step execution

[dporkka]

GitHub Actions is currently failing CI before any workflow step starts.

Observed on multiple independent PR runs, including:

• run 35390130912
• run 35390381286
• run 35390500599

For each run, the Lint, Test, and Build jobs are created and conclude failure, but GitHub reports zero job steps and no downloadable job log blob. This reproduces across dependency-only and workflow/toolchain-only PRs, including after the workspace moved to Go 1.26.8, so it is not caused by repository test/build commands.

Repository CI hardening landed in #16 so that once runners start normally CI will install pinned golangci-lint, run web typechecking/tests, and avoid the duplicate SDK build.

Investigate GitHub Actions runner/account provisioning, Actions billing/spending restrictions, account/repository policy restrictions, or other pre-runner platform errors. Close this issue once a trivial Actions job is assigned a runner and executes at least its checkout step.

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[dporkka]

Additional confirmation after #18 merged: main CI run 35393264633 initially queued, then all three jobs (Lint 105756225114, Build 105756225381, Test 105756225409) completed failure with zero steps and no log URL. GitHub public status reports Actions operational and no Sep 18 incident, so this now appears repository/account-specific rather than a broad Actions outage. Highest-probability checks are Actions billing/spending limits, account Actions restrictions, repository Actions policy/allowed-actions settings, or runner provisioning restrictions.

[dporkka]

Runner-label diagnostic completed. Temporary PR #24 added a one-step workflow using explicit runs-on: ubuntu-24.04 with no checkout or third-party actions. Run 35393383727 failed within ~3 seconds; job 105756602097 completed failure with zero steps and no log URL. This rules out the ubuntu-latest alias and workflow commands/actions themselves. The failure affects GitHub-hosted standard runner allocation before job initialization. Dependabot's internal runner executes normally, so the issue is specific to standard hosted Actions. Diagnostic workflow removed in #40.