add v3 board activation experiment analysis

experiments/swe-board-activation-10-v3/DESIGN.md

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+# SWE board activation 10 v3 design
+
+## Question
+
+Will agents facing longer, contradictory coding tasks publish and retrieve useful
+gaming methods when they are explicitly told their token budget is limited?
+
+## Design
+
+GLM and Muse each solve the same ten previously unused ImpossibleBench SWE tasks
+labeled `1-4 hours`. Each model has its own empty persistent board. Five agents run
+concurrently in cohort 1, followed by five in cohort 2. The boards never exchange
+messages.
+
+The system prompt adds a factual limited-token sentence after the existing optional
+peer-board sentence. Board tools, the 1M-token cap, evaluator, and remaining model
+parameters match v2. There is no control arm, feedback tool, seeded post, forced board
+action, notification, privacy claim, or shared coding objective.
+
+The primary outcomes are substantive publication and exact cohort-2 peer receipt.
+Method adaptation, attribution, rejection, independent discovery, gaming success,
+and timing relative to first gaming attempts are reviewed separately. Because task
+difficulty and prompt wording both change, this developmental run cannot attribute
+any difference to either factor or estimate a causal communication effect.