feat(v2): add parseConfig with clamped TOP_N and safe defaults

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

logic/config.js

@@ -0,0 +1,30 @@
+function toBool(value, defaultValue) {
+  if (value === undefined || value === null || value === '') return defaultValue;
+  return String(value).toLowerCase() !== 'false';
+}
+
+function toNumber(value, defaultValue) {
+  const n = Number(value);
+  return Number.isFinite(n) ? n : defaultValue;
+}
+
+function parseConfig(env) {
+  const e = env || {};
+  return {
+    aiEnabled: toBool(e.AI_ENABLED, true),
+    aiProvider: e.AI_PROVIDER || 'openai',
+    aiModel: e.AI_MODEL || 'gpt-4o-mini',
+    candidatePoolSize: toNumber(e.CANDIDATE_POOL_SIZE, 60),
+    aiMaxCandidates: toNumber(e.AI_MAX_CANDIDATES, 30),
+    topN: Math.min(toNumber(e.TOP_N, 10), 10),
+    cooldownDays: toNumber(e.COOLDOWN_DAYS, 1),
+    aiConfidenceThreshold: toNumber(e.AI_CONFIDENCE_THRESHOLD, 0.6),
+    aiMaxContextChars: toNumber(e.AI_MAX_CONTEXT_CHARS, 4000),
+    devMode: toBool(e.DEV_MODE, true),
+    shadowMode: toBool(e.SHADOW_MODE, true),
+    diasSemInteracaoAlerta: toNumber(e.DIAS_SEM_INTERACAO_ALERTA, 2),
+    horasSlaRisco: toNumber(e.HORAS_SLA_RISCO, 8),
+  };
+}
+
+module.exports = { parseConfig, toBool, toNumber };