Add landing site + kane-cli reference example

[siddhant573]

What

Two additive pieces, no changes to existing code:

• examples/kane-cli/ — a real, sanitized .evidence pack produced by kane-cli (a 27-step nested-iframe e-commerce checkout), plus overview.md walking through who-writes-what. It's the worked reference any producer can copy. Validates at L0 and L1 (evidence validate … --profile L0|L1 → ok).
• site/ — a self-contained static landing page (plain index.html + styles.css, no build), in the repo's design-viewer visual family.

The page's story

1. Hero — one shape for what a test run produced; install command; "kane-cli already emits it · point any of these at the same shape".
2. The pack — the L0 layout (run.yaml / opaque definition / result.yaml).
3. Try it — download the sample .evidence pack (site/kane-cli.evidence, a relative link so it works on any host) and drop it into the hosted viewer at evidence.lambdatest.com. No ?pack= URL, so nothing 404s on a local or pre-deploy preview.
4. Reference producer — kane-cli already speaks the format; links to the example and the walkthrough. Emit the same shape from your framework and the same viewer renders it — no viewer to build.
5. Profile ladder (L0/L1) and library-vs-CLI usage.

Hosting

The page is not wired to a deploy workflow — site/ is static and meant to be hosted separately. Asset links are relative; the embedded viewer is evidence.lambdatest.com and the sample downloads from the same origin.

Verification

• Example pack validates at L0 and L1; L1 layer matches overview.md (27 steps / 27 screenshots / 110-request HAR); public-safety scanned (CVV masked, external_id neutralized, no emails/tokens/auth headers).
• Page rendered and checked at desktop and narrow widths (no horizontal overflow); download link and viewer embed verified.

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