chore(knowledge): drop verbose snippet payloads from resolve log

Logging the full candidate and selected snippet bodies per resolve was
inflating log volume without adding signal we use.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/app/knowledge_service.go

@@ -854,12 +854,11 @@ func (s *KnowledgeService) logKnowledgeResolve(
 		zap.Int("candidate_count", len(candidates)),
 		zap.Int("selected_count", len(selected)),
 		zap.Int("precise_fact_count", len(knowledgeCtx.PreciseFacts)),
-		zap.Any("candidates", summarizeKnowledgeSnippetsForLog(candidates)),
-		zap.Any("selected_snippets", summarizeKnowledgeSnippetsForLog(selected)),
 		zap.Strings("precise_facts", summarizeKnowledgeFactsForLog(knowledgeCtx.PreciseFacts)),
 	)
 }
 
+// for debug
 func summarizeKnowledgeSnippetsForLog(snippets []KnowledgeSnippet) []map[string]any {
 	if len(snippets) == 0 {
 		return []map[string]any{}