Docs clarification: background=true + store=false support and 24-hour Interactions retention #3153

Documentation clarification (no live backend reproduction)

Two current official guides appear to disagree about Interactions API background execution and temporary result storage:

• Background execution — Data retention for background execution: describes background=true with store=false as retaining the project interaction for 24 hours for GET retrieval. The REST examples use Api-Revision: 2026-05-20 and the guide lists standard model gemini-4-argon as supported.
• Interactions overview — Data storage and retention: says store=false is incompatible with background execution, and describes longer retention for stored paid-tier interactions.

Could you clarify the current contract for the Gemini Developer API v1beta/interactions, standard model gemini-4-argon, revision 2026-05-20?

1. Is background=true, store=false supported, with results retrievable by the returned interaction ID?
2. If supported, what is the maximum request/result retention period, when does that clock begin, and does the same bound apply to completed, failed and cancelled interactions?
3. Is the stated 24-hour project-retrieval TTL distinct from other provider logging/retention policies that an application must consider? Which official document defines those boundaries?
4. If store=true is actually required, is there any officially supported at-most-24-hour background request/result retention option for a paid-tier project?

Please point to the applicable model/revision-specific documentation or correct the conflicting wording. This is a documentation question, not a claim that a particular combination has been tested. No account information, credentials, research content or provider response is included.