feat(ads): add measurement tags to Ad contract

[idoshamun]

What

Extends the skadi `Ad` signature with third-party measurement support for enterprise advertisers (CM360 JS/iframe tags, DoubleVerify viewability/IVT/suitability).

```ts
export interface Ad {
// ...
tags?: AdMeasurementTag[];
}

export interface AdMeasurementTag {
markup: string; // raw tag HTML, macros unsubstituted
overlay?: boolean; // frame must cover the creative (e.g. DV viewability)
}
```

Why this shape

• Server describes, client decides execution. No ad-level `renderMode` — the same DV ad runs inline on webapp but inside a web-origin frame on the extension (MV3 CSP forbids remote JS in the extension page). Framing is a per-surface decision, not a property of the ad.
• `pixel[]` stays the native path. skadi sends image impression trackers in the existing `pixel[]` whenever available, so the common CM360 advertiser is fully native and frameless on every surface. `tags[]` is the escape hatch only for JS-based measurement.
• No vendor field. Client behavior is identical regardless of vendor: inject markup, substitute macros, fire.
• One frame per ad. On the extension all of an ad's `tags[]` load into a single web-origin frame; `overlay` is ORed across them — card-sized only when geometry is actually required, otherwise 0×0 hidden.
• `markup` unsubstituted. Cachebuster/consent macros (`${GDPR}`, `[timestamp]`) are filled client-side at fire time.

Scope

Signature only. Rendering (native macro substitution on web, the web-origin measurement frame on the extension) lands in follow-ups. Coordinate with the ad-server team so skadi populates `tags[]` accordingly.

Ref: `plans/cm360-doubleverify-support.md`

Preview domain

https://feat-ad-measurement-tags-signatu.preview.app.daily.dev

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Project	Deployment	Actions	Updated (UTC)
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