fix: aplicar umbral de cobertura en publishGroupCoveragePrompt

Co-authored-by: aider (openrouter/openai/gpt-5) <aider@aider.chat>

src/services/onboarding.ts

@@ -223,6 +223,14 @@ export function publishGroupCoveragePrompt(db: Database, groupId: string, ratio:
       return;
     }
 
+    // Umbral de cobertura: publicar solo si ratio < threshold (por defecto 1.0)
+    const thrRaw = Number(process.env.ONBOARDING_COVERAGE_THRESHOLD);
+    const threshold = Number.isFinite(thrRaw) ? Math.min(1, Math.max(0, thrRaw)) : 1;
+    if (!(ratio < threshold)) {
+      try { Metrics.inc('onboarding_prompts_skipped_total', 1, { group_id: groupId, reason: 'coverage_100' }); } catch {}
+      return;
+    }
+
     // Gating enforce
     try {
       const mode = String(process.env.GROUP_GATING_MODE || 'off').toLowerCase();