feat: add cover image to MCP Installation page

Adds mcp-cover.png to docs/api-reference/.gitbook/assets and references
it from the MCP Installation page frontmatter. Updates the codegen
delete pattern to preserve the asset folder and the hand-maintained
mcp-installation.md across regenerations, and removes the page from the
codegen source tree (it no longer flows through metalsmith, so its
frontmatter — including cover — is preserved verbatim).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: sybohy

codegen/smith.ts

@@ -26,6 +26,8 @@ await Promise.all([
     `./${apiReferenceRoot}/**`,
     `!./${apiReferenceRoot}/SUMMARY.md`,
     `!./${apiReferenceRoot}/.gitbook.yaml`,
+    `!./${apiReferenceRoot}/.gitbook/**`,
+    `!./${apiReferenceRoot}/mcp-installation.md`,
   ]),
 ])
 

codegen/source/docs/api-reference/mcp-installation.md

@@ -1,3 +1,8 @@
+---
+description: Connect the Seam Docs MCP server to Claude to search Seam's API reference and device database from inside your conversations.
+cover: .gitbook/assets/mcp-cover.png
+coverY: 0
+---
 
 # MCP Installation