nostr:npub1l5sga6xg72phsz5422ykujprejwud075ggrr3z2hwyrfgr7eylqstegx9z I addressed the http nostr links in frame of sharing nostr native links best practices as described in the nostrability issue.

There are recommendations for all three apps you mentioned - jumble.social, lumina.rocks, and primal web.

As for discovery of nostr apps, this is a great, and bigger outstanding question.

Here is the NIP-89 tracker https://github.com/nostrability/nostrability/issues/7

In there is a ‘client tag’ column, which could be used to signal nostr app usage cross apps.