test(mcp): expect Obsidian '> [!info]' callout export in e2e (#333 canon)

PR #333 deliberately changed the canonical markdown export of callout
nodes to the Obsidian-native format ('> [!type]' + blockquote body,
pinned by packages/prosemirror-markdown unit tests); the importer still
parses both ':::type' fences and '> [!type]'. The get_page e2e assertion
was missed in that switch and still expected ':::info', failing the
e2e-mcp job on develop since 4369bbc5.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/mcp/test-e2e.mjs

@@ -450,7 +450,7 @@ async function main() {
     // 8. get_page markdown round-trip sanity (table separator present)
     const md = await client.getPage(pageId);
     check("get_page md: table separator emitted", md.data.content.includes("| --- |"), "");
-    check("get_page md: callout exported as :::", md.data.content.includes(":::info"));
+    check("get_page md: callout exported as Obsidian '> [!info]'", md.data.content.includes("> [!info]"));
 
     // 9. comments: create / list / reply / update / check_new / delete
     const beforeComments = new Date(Date.now() - 1000).toISOString();