fix: clarify gitmem log header to "most recent learnings"

Replaces opaque "10 entries" with "10 most recent learnings" so users
understand what the output represents without needing prior context.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

src/tools/log.ts

@@ -64,7 +64,7 @@ export interface LogResult {
 
 function buildLogDisplay(entries: LogEntry[], total: number, filters: LogResult["filters"]): string {
   const lines: string[] = [];
-  lines.push(`gitmem log · ${total} entries · ${filters.project}`);
+  lines.push(`gitmem log · ${total} most recent learnings · ${filters.project}`);
   const fp: string[] = [];
   if (filters.learning_type) fp.push(`type=${filters.learning_type}`);
   if (filters.severity) fp.push(`severity=${filters.severity}`);