docs(product): require measured asynchronous capacity

[seonghobae]

Outcome

• requires long-running web work to remain asynchronous and observable
• makes authenticated synthetic k6 concurrency evidence and a measured capacity envelope part of release acceptance
• does not invent a concurrency target before the workload produces evidence

Verification

• uv run --extra dev pytest tests/test_documentation_hygiene.py -q
• git diff --check

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Reviewing files that changed from the base of the PR and between c8131a2 and 2481a5c.

📒 Files selected for processing (1)

• docs/product-requirements.md

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.