refactor(skills): move marketing-psychology catalogs to references

Keep the decision steps in SKILL.md and move catalogs, examples, and
checklists verbatim to references/ to reduce the context cost of loading the
skill.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shared/skills/marketing-psychology/references/design-delivery.md

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+# Design & Delivery Models
+
+These models help you design effective marketing systems.
+
+## Hick's Law
+Decision time increases with the number and complexity of choices. More options = slower decisions = more abandonment.
+
+**Marketing application**: Simplify choices. One clear CTA beats three. Fewer form fields beat more.
+
+## AIDA Funnel
+Attention → Interest → Desire → Action. The classic customer journey model.
+
+**Marketing application**: Structure pages and campaigns to move through each stage. Capture attention before building desire.
+
+## Rule of 7
+Prospects need roughly 7 touchpoints before converting. One ad rarely converts; sustained presence does.
+
+**Marketing application**: Build multi-touch campaigns across channels. Retargeting, email sequences, and consistent presence compound.
+
+## Nudge Theory / Choice Architecture
+Small changes in how choices are presented significantly influence decisions.
+
+**Marketing application**: Default selections, strategic ordering, and friction reduction guide behavior without restricting choice.
+
+## BJ Fogg Behavior Model
+Behavior = Motivation × Ability × Prompt. All three must be present for action.
+
+**Marketing application**: High motivation but hard to do = won't happen. Easy to do but no prompt = won't happen. Design for all three.
+
+## EAST Framework
+Make desired behaviors: Easy, Attractive, Social, Timely.
+
+**Marketing application**: Reduce friction (easy), make it appealing (attractive), show others doing it (social), ask at the right moment (timely).
+
+## COM-B Model
+Behavior requires: Capability, Opportunity, Motivation.
+
+**Marketing application**: Can they do it (capability)? Is the path clear (opportunity)? Do they want to (motivation)? Address all three.
+
+## Activation Energy
+The initial energy required to start something. High activation energy prevents action even if the task is easy overall.
+
+**Marketing application**: Reduce starting friction. Pre-fill forms, offer templates, show quick wins. Make the first step trivially easy.
+
+## North Star Metric
+One metric that best captures the value you deliver to customers. Focus creates alignment.
+
+**Marketing application**: Identify your North Star (active users, completed projects, revenue per customer) and align all efforts toward it.
+
+## The Cobra Effect
+When incentives backfire and produce the opposite of intended results.
+
+**Marketing application**: Test incentive structures. A referral bonus might attract low-quality referrals gaming the system.