ci(e2e): Phase 6 — nightly-chaos-sigint cell

[EnderOfWorlds007]

Phase 6 (partial) — SIGINT chaos test only. RPC failover (S18) deferred to a follow-up because it requires a small source change to add an RPC override env var.

Summary

• New e2e/cli/chaos.test.ts with one test: spawns dot deploy in headless mode, waits for ▸ storage-and-dotns sentinel (storage phase start) up to 60s, then sends SIGINT and asserts the process exits cleanly within 5s.
• New nightly-chaos-sigint cell in test-nightly-no-publish (schedule/dispatch only — no publish since the deploy is interrupted before the registry phase).
• Dedicated E2E_DOMAINS.chaos (e2e-cli-chaos) to avoid racing the happy-path storage domain in a nightly that runs all matrices.
• CLAUDE.md updated: 11 → 12 cells.
• Stacked on PR ci(e2e): Phase 5d — nightly-rejections cell #91 (Phase 5d, branch ci/e2e-phase-5d-rejections). Will rebase once that merges.

Test plan

• pnpm exec tsc --noEmit — no errors
• pnpm test — 445 tests pass
• pnpm format — no changes needed
• pnpm exec vitest run --config e2e/vitest.config.ts -t "dot deploy — chaos" — 1 test collected and passes locally (process errors during preflight on local environment, SIGINT lands cleanly, exit is valid)
• First post-merge nightly: verify SIGINT fires mid-storage-phase + clean exit + no zombie processes

Out of scope

• Phase 6 S18 (RPC failover) — needs source change (env-var override for RPC URLs)
• Phase 5e (modable), 5f (cdm fixture), Phase 7 (published binary)

[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-6-sigint bash

[github-actions]

E2E Test Pass · ✅ PASS

Tag: e2e-ci-pr · Branch: ci/e2e-phase-6-sigint · Commit: 4381b11 · Run logs

Cell	Result	Time
pr-deploy-foundry	✅ PASS	1m37s
pr-deploy-frontend	✅ PASS	7m11s
pr-mod	✅ PASS	1m30s
pr-preflight	✅ PASS	4m16s
pr-install	✅ PASS	0m48s
pr-init-session	✅ PASS	1m12s
${{ matrix.cell }}	⏭️ SKIP	0m-1s
${{ matrix.cell }}	⏭️ SKIP	0m-1s

Sentry traces: view spans for this run