feat: remove lat/long targeting, daily budget caps, and order-level frequency caps

[bokelley]

Summary

Modernizes AdCP protocol targeting and budget models to be more privacy-first, AI-optimized, and implementation-friendly.

Changes Made

🌍 Remove Lat/Long Targeting (Privacy-First)

• Removed: geo_lat_long_radius targeting option from schemas and documentation
• Kept: Country, region, metro, and postal code targeting for sufficient granularity
• Rationale: Aligns with modern privacy regulations and reduces implementation complexity
• Coverage: Geographic hierarchy covers legitimate targeting needs while eliminating privacy risks

💰 Budget Model Modernization (Remaining Budget Allocation)

• Removed: daily_cap field from budget schema
• Updated: Pacing strategy descriptions to focus on "remaining budget over remaining time"
• Rationale: More resilient to human-in-the-loop approval delays and AI-friendly
• Default: "even" pacing allocates remaining budget evenly over remaining campaign duration

⏱️ Simplify Frequency Caps (Package-Level Only)

• Removed: media_buy scope option for frequency caps
• Simplified: Frequency caps now only apply at package level
• Rationale: Covers 80% of real-world use cases while reducing configuration complexity
• Impact: Eliminates scope selection confusion and simplifies implementation

Test Results

• ✅ All schema validation tests pass
• ✅ All example validation tests pass
• ✅ TypeScript compilation successful
• ✅ Documentation synchronized with schema changes

Protocol Design Analysis

Based on ad tech expert review:

• ✅ Privacy-first: Aligns with GDPR/CCPA and modern platform trends
• ✅ AI-optimized: Remaining budget allocation better for automated workflows
• ✅ Implementation-friendly: Reduced complexity while maintaining advertiser effectiveness
• ✅ Future-ready: Positions AdCP well for privacy-first, AI-driven advertising landscape

Breaking Changes

These are intentionally breaking changes to modernize the protocol:

1. geo_lat_long_radius targeting no longer supported
2. daily_cap budget field removed
3. scope field removed from frequency caps (package-level implicit)

Migration Path

• Geographic targeting: Use postal codes for local targeting, metro/region for broader areas
• Budget management: Remove daily_cap usage, rely on pacing strategies for allocation
• Frequency caps: Remove scope field from frequency cap configurations

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