Remove redundant format fields (accepts_3p_tags, category, is_standard)

[bokelley]

Summary

Removed three redundant fields from the AdCP format schema that were carrying information already expressed through other means.

Fields Removed

1. accepts_3p_tags

Why: Redundant with HTML/JavaScript asset types

• Third-party tags ARE HTML/JavaScript assets
• To find tag-compatible formats, filter by asset_types: ["html"] or ["javascript"]
• No need for separate boolean flag

2. category

Why: Redundant with format source location

• Standard formats are defined in /schemas/v1/standard-formats/ directory
• Custom formats have agent_url pointing to a custom creative agent
• Format location already indicates whether it's standard or custom

3. is_standard

Why: Same rationale as category - redundant with source location

Changes Made

• ✅ Updated core format schema (format.json)
• ✅ Updated 15 standard format schemas
• ✅ Removed fields from all documentation examples
• ✅ Added migration guide to CLAUDE.md
• ✅ All tests passing

Migration

For consumers of the API:

• Instead of checking accepts_3p_tags, filter by asset_types: ["html"] or ["javascript"]
• Instead of checking is_standard or category, check format source:
  • Standard formats come from reference creative agent or /standard-formats/ path
  • Custom formats have agent_url pointing to custom agents

Impact

• Breaking: Only if code explicitly checks these fields
• Benefit: Cleaner schema, less redundancy, easier maintenance
• Lines removed: 175 lines of redundant field definitions

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