[psanders]

Three small changes.

1. project.favicon (feat). perfkit.yaml takes an optional project.favicon: a path relative to perfkit.yaml, .svg only, the same as project.logo. perfkit validate checks that the file exists. The run reads it when it starts and inlines it as project.faviconSvg in report.json and live.json (perfkit/live/v1 reuses the report's project schema). Every page head links it as <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,..."> (URL-encoded SVG): the shells (index.html and each runs/<id>/index.html, so the tab has its icon before the app draws), the run page and the live page. The shells use the favicon of the report being rendered. Without a favicon, no link is written and the pages stay byte for byte the same. The JSON Schema files are regenerated (npm run schemas).

2. Step length check (fix). SIPp writes its counters every 10 s, so a capacity step whose load.rate.every is not a multiple of 10 s mixes two steps. Validation now rejects it: benchmarks[0].load.rate.every: expected a multiple of 10 s (SIPp reports every 10 s); got 15s. The duration-to-seconds helper moved out of checkWarmupShorterThanStep into src/schemas/durationSeconds.ts so both checks use it.

3. History copy (fix). "Every run keeps its own page and report.json. Open one to see it exactly as it was." is now "Every run keeps its own page and report.json.", because the current app redraws every page.

Docs: docs/perfkit-yaml.md (field table and example), docs/report-v1.md (project.faviconSvg), docs/report-page.md, and the README's Capacity section.

For callers pinning a version: perfkit.yaml gains an optional field and rejects steps that aren't a multiple of 10 s (the examples use 60s). report.json and live.json gain an optional project.faviconSvg. The workflow inputs are unchanged.

Verify: npm test (643 passing), npm run typecheck, npm run lint.

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