docs(docs): add archetype evidence presentation spec (#443)
Design specification for how evidence is presented differently per archetype — detective case file (institutional, insert-assisted) vs smuggler notebook (personal, unassisted). Covers item definitions, knowledge graph presentation, contradiction markers, THE FRIEND arc walkthroughs, systems interaction map, and authoring guidelines. Sprint 7, ticket #443. Authored by Mellanie (copy), Paula (narrative), Gestalt (systems). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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