fix(mcp): mcp auth returns "Unexpected status: disabled" after successful OAuth #20278

Bug

After completing OAuth for a remote MCP server, opencode mcp auth <name> shows:

┌  MCP OAuth Authentication
│
■  Unexpected status: disabled
│
└  Done

Even though the authentication itself succeeded.

Root Cause

In finishAuth (packages/opencode/src/mcp/index.ts), after OAuth completes successfully, createAndStore(mcpName, mcpConfig) is called with the raw config from getMcpConfig(). If the server has enabled: false (e.g. was previously disconnected), create() short-circuits and returns { status: "disabled" } without attempting to connect.

The authenticate CLI handler doesn't have a case for "disabled" status, so it falls through to the else branch printing "Unexpected status: disabled".

Fix

Pass { ...mcpConfig, enabled: true } to createAndStore in finishAuth, matching what connect() already does.