Fix #263: prove Deno close rejection behavior

[flyingrobots]

Summary

• replace the tautological Deno close rejection assertion with observable shutdown proof
• keep the no-unhandled-rejection coverage while proving the server handle is cleared

Closes #263

Validation

• npm exec vitest run test/unit/infrastructure/adapters/DenoHttpAdapter.test.ts
• pre-push IRONCLAD gates 0-7 passed with WARP_QUICK_PUSH=1

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5036457f-03b1-4f82-81f9-5cf0d3591a0c

📥 Commits

Reviewing files that changed from the base of the PR and between a21fb8b and 7b9d72b.

📒 Files selected for processing (1)

• test/unit/infrastructure/adapters/DenoHttpAdapter.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-263-deno-close-proof

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[github-actions]

Release Preflight

• package version: 18.0.0
• prerelease: false
• npm dist-tag on release: latest
• npm pack dry-run: passed
• jsr publish dry-run: passed

If you tag this commit as v18.0.0, release workflow will publish.

[flyingrobots]

Code Lawyer Activity Summary

@codex please confirm this review posture.

Source	Severity	File	Lines	Finding	Outcome
Self-review	None	test/unit/infrastructure/adapters/DenoHttpAdapter.test.ts	L347-L351	No actionable issue found. The tautological assertion is replaced with observable shutdown and state-clear proof.	No code change required.
PR threads	None	n/a	n/a	No unresolved review threads found by GraphQL review-thread query.	No code change required.

Validation considered:

• Existing PR CI check rollup is green.
• Prior focused validation: npm exec vitest run test/unit/infrastructure/adapters/DenoHttpAdapter.test.ts.