SEP-2243: mark as Final

The SEP was merged in modelcontextprotocol#2243 with Status: Draft. Update to Final and
regenerate SEP docs (index, docs.json, mdx).

Author: pja-ant

docs/docs.json

@@ -418,7 +418,8 @@
               "seps/2085-governance-succession-and-amendment",
               "seps/2133-extensions",
               "seps/2148-contributor-ladder",
-              "seps/2149-working-group-charter-template"
+              "seps/2149-working-group-charter-template",
+              "seps/2243-http-standardization"
             ]
           },
           {
@@ -427,12 +428,6 @@
               "seps/2207-oidc-refresh-token-guidance",
               "seps/2260-Require-Server-requests-to-be-associated-with-Client-requests"
             ]
-          },
-          {
-            "group": "Draft",
-            "pages": [
-              "seps/2243-http-standardization"
-            ]
           }
         ]
       },

docs/seps/2243-http-standardization.mdx

@@ -3,7 +3,7 @@
 <!-- cspell:ignore streamable -->
 <!-- markdownlint-disable MD036 MD060 -->
 
-- **Status**: Draft
+- **Status**: Final
 - **Type**: Standards Track
 - **Created**: 2026-02-04
 - **Author(s)**: MCP Transports Working Group