fix: Pass task with description to auto-spawned discuss agent

The discuss agent spawned on initiative creation received only the
initiative in its inputContext, missing the task that carries the user's
description. The agent started without knowing what to discuss.

apps/server/trpc/routers/initiative.ts

@@ -78,7 +78,7 @@ export function initiativeProcedures(publicProcedure: ProcedureBuilder) {
               prompt,
               mode: 'discuss',
               initiativeId: initiative.id,
-              inputContext: { initiative },
+              inputContext: { initiative, task },
             });
           } catch {
             // Fire-and-forget — don't fail initiative creation if agent spawn fails