fix(core): advertise the spec-shaped MCP elicitation capability (#53196)

Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/core/src/mcp/client.ts

@@ -185,7 +185,7 @@ export const connect = Effect.fnUntraced(function* (
     const runFork = Effect.runForkWith(yield* Effect.context())
     const client = new Client(clientInfo, {
       capabilities: {
-        ...(elicitation ? { elicitation: { form: { applyDefaults: true }, url: {} } } : {}),
+        ...(elicitation ? { elicitation: { form: {}, url: {} } } : {}),
         // Legacy era only: roots are deprecated as of 2026-07-28 and modern servers cannot request them.
         // Some legacy servers refuse to run without one (https://github.com/anomalyco/opencode/issues/2308).
         roots: {},