1.33.1 - MCP Adapter is no longer required

Yoko Core no longer requires the MCP Adapter plugin. 1.33.0 made it a hard requirement, so on a site without MCP Adapter, Yoko Core showed a missing-plugin notice and could not be reactivated. 1.33.1 removes the requirement. Nothing else changes from 1.33.0.

• [BUG FIX] MCP Adapter is no longer required. The Requires Plugins: mcp-adapter header added in 1.33.0 is gone. WordPress activates Yoko Core with or without MCP Adapter, and the missing-plugin notice from 1.33.0 disappears once a site updates. MCP Adapter was never used by Yoko Core's code, so a site that installed it only for 1.33.0 can keep it or remove it.