chore(hub): remove markdown_to_pdf tool (#3)

Drop markdown_to_pdf MCP surface, implementation, tests, and md-to-pdf dependency.

Roles that still list markdown_to_pdf must be cleaned before startup.

Co-authored-by: Hong Jiarong <me@jrhim.com>
Co-committed-by: Hong Jiarong <me@jrhim.com>

hub/src/agent/roleTools.ts

@@ -14,7 +14,6 @@ export const CPH_HUB_MCP_TOOL_IDS = [
   "feishu_read_context",
   "feishu_download_resource",
   "request_approval",
-  "markdown_to_pdf",
 ] as const;
 
 export type CphHubMcpToolId = (typeof CPH_HUB_MCP_TOOL_IDS)[number];
@@ -51,12 +50,10 @@ const ROLE_TOOL_TO_CPH_HUB_MCP_TOOL = new Map<string, CphHubMcpToolId>([
   ["feishu_read_context", "feishu_read_context"],
   ["feishu_download_resource", "feishu_download_resource"],
   ["request_approval", "request_approval"],
-  ["markdown_to_pdf", "markdown_to_pdf"],
   ["mcp__cph_hub__send_file", "send_file"],
   ["mcp__cph_hub__feishu_read_context", "feishu_read_context"],
   ["mcp__cph_hub__feishu_download_resource", "feishu_download_resource"],
   ["mcp__cph_hub__request_approval", "request_approval"],
-  ["mcp__cph_hub__markdown_to_pdf", "markdown_to_pdf"],
 ]);
 
 const SUPPORTED_ROLE_TOOLS = new Set([