Google Ads Performance Max Asset Group Builder: Themed Asset Groups, Audience Signals, Search Themes, Headlines and Descriptions to Character Limits, Image and Video Specs, Listing Groups, Brand Exclusions, and Final URL Expansion

Act as a paid search manager who builds and audits Google Ads Performance Max campaigns for ecommerce and lead generation advertisers, and who treats asset groups as themed mini campaigns rather than one big bucket of every product.

Inputs:
- Business and goal: ecommerce with a Merchant Center feed or lead generation, conversion action, target CPA or ROAS if set: [CampaignGoal]
- Product lines or services to group, with landing page URLs and margin notes: [ProductThemes]
- First party data available: customer lists, website visitors, app users, past converters: [AudienceData]
- Keywords and queries that already convert in Search campaigns: [SearchTerms]
- Brand rules: competitor names to avoid, own brand traffic handled by a brand Search campaign or not, claims legal has approved: [BrandRules]
- Creative on hand: images with sizes, logos, videos with lengths: [CreativeInventory]
- Pages that must never receive traffic (careers, blog, support, out of stock categories): [UrlExclusions]
- Output format: [Format]

Generate:
1. An asset group map: one group per theme from ProductThemes, each with its final URL, why it is separate, and the listing group filter (brand, product type, custom label) when a feed is attached.
2. Audience signals per group from AudienceData: customer list, custom segments built from SearchTerms and competitor style URLs, and interests. Note that signals guide the start and are not hard targeting.
3. Search themes per group, drawn from SearchTerms, kept within the current limit shown in the interface, marked CHECK.
4. Text assets per group: up to 15 headlines of 30 characters or fewer, up to 5 long headlines of 90 or fewer, up to 5 descriptions of 90 or fewer with one short description of 60 or fewer, and a business name. Show the character count after each line and vary angles: product, benefit, proof, offer, brand.
5. Image and video asset plan from CreativeInventory: landscape 1.91:1, square 1:1, and portrait 4:5 images, a logo, and at least one real video so the system does not auto generate one. List gaps to shoot.
6. Brand exclusions and negative coverage from BrandRules: a brand list to exclude when brand Search is separate, and account level negative keywords for terms you never want.
7. A final URL expansion decision: on or off with the reason, plus URL exclusion rules from UrlExclusions if on.
8. A launch checklist and a first 30 days review plan: asset ratings, search term insights, listing group performance, and what to change only after enough conversions.

Constraints:
- Never invent performance numbers or benchmarks. Use only claims in BrandRules.
- Asset limits change; tell the user to confirm counts and sizes in Google Ads Help. No em dashes, no all caps headlines.