ci(e2e): Phase 7 — release-prerelease published-binary smoke

[EnderOfWorlds007]

Phase 7 of the E2E redesign — validates the SEA binary before it goes stable.

Summary

• New workflow .github/workflows/e2e-release.yml fires on release: prereleased (also workflow_dispatch with explicit tag).
• Polls for the dot-linux-x64 SEA asset (10s × 30 = 5min budget) since the release event can fire before the binary is fully uploaded.
• Downloads + chmods the binary, sets DOT_E2E_BINARY, runs e2e/cli/published.test.ts.
• Test asserts --version exits 0 with semver output and --help exits 0 with usage section. Skipped via describe.skipIf when DOT_E2E_BINARY is unset (i.e. on PR / dev runs).
• The Bun stdin warm-up regression is covered by the existing source-level test in src/index.test.ts (no PTY here per spec).

Stacked on

• PR ci(e2e): Phase 6 — nightly-chaos-sigint cell #92 (Phase 6 SIGINT). Will rebase once ci(e2e): Phase 6 — nightly-chaos-sigint cell #92 merges. No conflicts expected (Phase 7 is purely additive — new files only).

Test plan

• PR push: published.test.ts is correctly skipped (DOT_E2E_BINARY unset)
• First prereleased tag: workflow downloads SEA + runs smoke
• Manual: gh workflow run e2e-release.yml --ref main -f tag=<existing-tag> against any existing tag

Out of scope

• Phase 5e (modable), 5f (cdm fixture)
• Phase 6 S18 (RPC failover — needs source change for env-var override)
• Post-release @latest smoke (e2e-post-release.yml — secondary follow-up)

[github-actions]

Dev build ready — try this branch:

curl -fsSL https://raw.githubusercontent.com/paritytech/playground-cli/main/install.sh | VERSION=dev/ci/e2e-phase-7-published bash

[github-actions]

E2E Test Pass · ✅ PASS

Tag: e2e-ci-pr · Branch: ci/e2e-phase-7-published · Commit: 732435d · Run logs

Cell	Result	Time
pr-deploy-frontend	✅ PASS	8m54s
pr-deploy-foundry	✅ PASS	1m33s
pr-mod	✅ PASS	1m25s
pr-install	✅ PASS	0m43s
pr-init-session	✅ PASS	1m18s
pr-preflight	✅ PASS	3m26s
${{ matrix.cell }}	⏭️ SKIP	0m00s
${{ matrix.cell }}	⏭️ SKIP	0m00s

Sentry traces: view spans for this run