Docs: v5 as the default API spec, and a memory-first description of the docs home

- The docs llms.txt listed the v4 OpenAPI spec first, because docs.json's top-level `api.openapi` was v4. No page
  uses that default (all 71 endpoint pages take their version's spec: 41 legacy, 30 v5), so it's now v5 and v4 stays
  on the Legacy (v3, v4) version.
- The docs home's description, which is also the first line of the docs llms.txt, read "Context infrastructure for AI
  agents". AI answers have been framing supermemory as RAG-first, so it now leads with memory: "The memory engine for
  AI agents: a memory graph that updates and forgets, user profiles, and retrieval over your documents".

Board: access-docs-llms-v4

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/docs/docs.json

@@ -10,7 +10,7 @@
 			"languages": ["typescript", "python", "bash"],
 			"prefill": true
 		},
-		"openapi": "https://api.supermemory.ai/v4/openapi"
+		"openapi": "https://api.supermemory.ai/v5/openapi"
 	},
 	"background": {
 		"color": {

apps/docs/index.mdx

@@ -1,6 +1,6 @@
 ---
 title: "Introduction"
-description: "Context infrastructure for AI agents"
+description: "The memory engine for AI agents: a memory graph that updates and forgets, user profiles, and retrieval over your documents"
 mode: "custom"
 ---