serviceability: add Feed catalog account and CRUD#3953
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Add a Feed account (metro(exchange) -> group-set catalog) with create/update/delete managed by a catalog admin (FEED_AUTHORITY Permission or FOUNDATION), plus Rust SDK command builders and a 'doublezero feed' CLI. A feed with no metros imposes no restriction.
This was referenced Jun 30, 2026
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Stack — review/merge bottom-up. Replaces #3952.
SetAccessPassFeeds---## Summary
Feedaccount: ametro(exchange) → group-setcatalog, withcreate/update/deletemanaged by a catalog admin (FEED_AUTHORITYPermission orFOUNDATION). A feed with an empty metro map imposes no restriction.doublezero feedCLI (create/update/get/list/delete).AccessPass/EdgeSeat changes here.Testing Verification
Feed::groups_forunit tests (covered / not-covered / unrestricted) and borsh round-trip; SDK command-builder tests; CLI--metro EXCHANGE=GROUP,GROUPparsing.