experiment: classify answer evidence direction

Move EVIDENCE_DIRECTION_GROUPS out of the mock fixture library into
lib/graph/evidence-direction.js where it belongs. Remove unused
DECISION_CONDITIONS and CONTRADICTION_KEYWORDS exports from scenarios.

Add Experiment 24A entry to the design log.

lib/mocks/scenarios.js

@@ -370,51 +370,4 @@ for (var key in SCENARIOS) {
   }
 }
 
-/* ── Decision Condition Definitions for the European market scenario ─ */
-
-export const DECISION_CONDITIONS = [
-  "Credible customer demand exists in Europe",
-  "European compliance is achievable",
-  "The expected market value justifies the cost of entry",
-  "The product offers sufficient competitive differentiation",
-];
-
-/* ── Decision Condition Support / Contradiction Concept Groups for generic matching ─ */
-
-export const CONDITION_CONCEPTS = {
-  demand: {
-    support: ["demand", "need", "customer", "interest", "audience"],
-    contradiction: [],
-  },
-  compliance: {
-    support: ["compliance", "regulation", "legal", "required", "mandatory", "gdpr", "data residency"],
-    contradiction: ["non-compliant", "impossible", "unable to comply", "blocked by regulation", "cannot meet regulation", "cannot comply"],
-  },
-  value_cost: {
-    support: ["cost", "investment", "justif", "viability", "financial", "revenue", "budget"],
-    contradiction: ["not viable", "too expensive", "unaffordable", "insufficient return", "no financial sense"],
-  },
-  differentiation: {
-    support: ["differentiat", "advantage", "competit", "positioning", "superior", "unique"],
-    contradiction: ["parity", "indistinguishable", "identical to competitor", "no differentiation", "same as others"],
-  },
-};
-
-/* ── Contradiction keyword patterns (any resolved node text matching triggers) ─ */
-
-export const CONTRADICTION_KEYWORDS = [
-  "not viable",
-  "impossible",
-  "unable to",
-  "blocked by",
-  "cannot meet",
-  "insufficient return",
-  "unaffordable",
-  "no financial sense",
-  "not competitive",
-  "parity with",
-  "identical to competitor",
-  "indistinguishable from",
-];
-
 export default SCENARIOS;