fix: remove hallucinated book title from marketing_campaign schema example

The schema hint on the task_name field contained a fictional example title
('The Starfall Accord Launch') that Maya was reading literally and using as
the real book name. Replaced with a neutral placeholder that explicitly
instructs Maya to use the ACTUAL title from the campaign brief.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

templates/marketing_campaign.yml

@@ -42,7 +42,7 @@ steps:
     packet_type: PlanningResponsePacket
     schema:
       tasks:
-        - task_name: "string -- descriptive name, e.g. 'Social Media Pack: The Starfall Accord Launch'"
+        - task_name: "string -- descriptive name using the ACTUAL book title from the campaign brief above, e.g. 'Social Media Pack: <real book title from brief>'"
           description: "string -- full brief for this content piece: product, audience, channel, phase, tone, CTA, word count"
           agents:
             - "string -- Zara (for copy/creative), Leo (for strategy/research)"