Add meta:tags to Paid Media class for Schema Editor class picker visibility

[ejsuncy]

Summary

Closes #2227

Adds meta:tags (industry: ["all"]) to the Paid Media class so it is offered in the AEP Schema Editor class picker. Metadata-only, additive, non-breaking.

Motivation

The Paid Media class (https://ns.adobe.com/xdm/classes/paid-media) does not appear in the Schema Editor class picker, even though it exists in the Schema Registry global container and schemas built on it work when created via the Schema Registry API.

Root cause: the class was missing meta:tags. Every XDM class that surfaces in the UI class picker carries an industry vertical tag — profile, experienceevent, and summarymetrics all have meta:tags.industry. The classes that lack meta:tags are the internal/system classes (campaign, consentpolicy, segmentdefinition, graphs, weather, …) plus paid-media. The picker groups/filters available global classes by industry vertical, so an untagged global class has no bucket to render under: reachable by $id via API, absent from the UI browse list.

Changes

• components/classes/paid-media.schema.json — add "meta:tags": { "industry": ["all"] }

Validation

• npm test — 2408 passing
• npm run lint — clean
• npm run validate schemas/paid-media components/classes — 74/74 passed, 0 failed
• npm run incompatibility-check — clean

Breaking changes

None. Metadata-only additive change; no properties, types, or enum values changed, no example updates required.