test(e2e): migrate crash-loop and gateway drift scenarios

[cv]

Summary

Draft planning PR for the E2E Vitest fan-out stack. This PR scopes the timing-sensitive sandbox recovery and gateway health slice.

Related Issue

Refs #4941
Refs #4990
Refs #4356
Depends on #5046, #5052, and the shared runtime-suite base stack.
Stacked on branch codex/e2e-fanout-10-sandbox-lifecycle-scenarios.

Changes

• Placeholder branch for test(e2e): migrate crash-loop and gateway drift scenarios.
• Planned scope: Migrate crash-loop recovery, gateway drift preflight, honest gateway health, concurrent gateway port, and tunnel lifecycle checks.
• No implementation changes yet; this draft should remain draft until code and verification are added.

Type of Change

• Code change (feature, bug fix, or refactor)
• Code change with doc updates
• Doc only (prose changes, no code sample modifications)
• Doc only (includes code sample changes)

Verification

• npx prek run --all-files passes
• npm test passes
• Tests added or updated for new or changed behavior
• No secrets, API keys, or credentials committed
• Docs updated for user-facing behavior changes
• npm run docs builds without warnings (doc changes only)
• Doc pages follow the style guide (doc changes only)
• New doc pages include SPDX header and frontmatter (new pages only)

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Signed-off-by: Carlos Villela cvillela@nvidia.com

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[cv]

Closing as superseded by #5106 and the post-#5098 one-E2E migration plan.

This branch belongs to the pre-cutover fanout stack. Any useful helper/scenario work should come back as a fresh, focused draft PR from current main: Vitest as the only E2E harness, GitHub Actions as the matrix, no revived runner path, no long-lived legacy-inventory.json roadmap expansion, and replacement/deletion evidence carried in the PR body plus linked issue.