feat: publish reproducible benchmark snapshot

[smiggleworth]

Summary

• publish a current Askr keyed/non-keyed benchmark snapshot on /platform
• include nine CPU operations measured by the js-framework-benchmark harness
• state the exact local version, browser mode, run count, and measurement date
• avoid unsupported cross-framework or release-to-release claims

Evidence

• keyed and non-keyed implementations built successfully against the local Askr workspace at 0.0.64
• benchmark harness compiled successfully
• all nine CPU operations completed for both variants, three measured runs each (plus harness warmups)
• memory-only cases intentionally excluded from the headline snapshot because they require a separate long-running soak

Validation

• npm run check
• git diff --check

Squash merge requested.

[Copilot]

Pull request overview

Publishes a reproducible, self-contained js-framework-benchmark CPU snapshot on the /platform marketing page, including the exact local Askr version/browser mode/run count/date and avoiding cross-framework claims.

Changes:

• Add a new “A measured starting point” section to the Platform marketing page with a benchmark results table.
• Introduce a new askrBenchmarkSnapshot constant containing the snapshot metadata and median timings for keyed/non-keyed operations.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/pages/marketing/platform.tsx	Renders the benchmark snapshot section and table on /platform.
src/pages/marketing/benchmarks.ts	Defines the snapshot metadata and per-operation timing rows used by the page.

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