feat(scoring): implemented semantic context padding and optimized excerpting v2.76.0

src/retrieval/scoring.ts

@@ -300,7 +300,7 @@ export function extractBestExcerpt(
     const sentences = content
         .split(/(?<=[.!?。！？\n])\s*/)
         .map((s) => s.trim())
-        .filter((s) => s.length > 10);
+        .filter((s) => s.length > 5);
 
     if (sentences.length === 0) return content.slice(0, maxLength);
 
@@ -343,8 +343,16 @@ export function extractBestExcerpt(
         }
     }
 
+    // 4. Result construction with semantic context padding
+    let finalStart = bestStart;
+    let finalEnd = bestStart + bestLen;
+
+    // 전후 문맥을 1문장씩 추가하여 의미적 완전성 확보 (예산 허용 시)
+    if (finalStart > 0) finalStart--;
+    if (finalEnd < scored.length) finalEnd++;
+
     const excerptSentences = scored
-        .slice(bestStart, bestStart + bestLen)
+        .slice(finalStart, finalEnd)
         .map((s) => s.sentence);
     
     const result = excerptSentences.join(' ');