ci(e2e): Phase 5a — nightly matrix framework + mod-miss + diagnostic cells

[EnderOfWorlds007]

Phase 5a of the E2E redesign — smallest slice of the nightly cube (spec §3b).

Summary

• New test-nightly-no-publish matrix gated on schedule || workflow_dispatch
• Two new cells reusing existing tests:
  • nightly-mod-miss — runs dot mod — registry miss describe block
  • nightly-diagnostic — runs diagnostic.test.ts
• Report job needs extended; AGGREGATE compute handles skipped cells correctly (PR runs skip the nightly matrix without flipping aggregate to fail)

Out of scope (subsequent sub-PRs)

• Phase 5b: nightly-deploy-hardhat (full deploy)
• Phase 5c-f: multi-contract, modable, rejections, cdm-fixture-upgrade
• Phase 6: chaos cells
• Phase 7: published-binary surface

Test plan

• PR push: nightly cells skipped, no false failures
• Manual: gh workflow run e2e.yml triggers the nightly matrix
• First real cron at 06:00 UTC will exercise the new path

[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-5a-nightly-framework bash

[github-actions]

E2E Test Pass · ✅ PASS

Tag: e2e-ci-pr · Branch: ci/e2e-phase-5a-nightly-framework · Commit: 177584a · Run logs

Cell	Result	Time
pr-preflight	✅ PASS	3m08s
pr-init-session	✅ PASS	1m19s
pr-deploy-foundry	✅ PASS	1m35s
pr-mod	✅ PASS	1m23s
pr-install	✅ PASS	0m40s
pr-deploy-frontend	✅ PASS	17m44s
${{ matrix.cell }}	⏭️ SKIP	0m00s

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