refactor(@angular/cli): implement weighted search for MCP examples

This commit improves the relevance of the `find_examples` MCP server tool by implementing weighted search ranking.

The FTS5 query now uses the `bm25()` ranking function to assign a higher weight to matches found in more important fields. Specifically, matches in the `title`, `summary`, and `keywords` are now weighted more heavily than matches in the main content.

This results in more accurate and intuitive search results, as examples where the query terms are central to the topic are ranked higher.

Author: clydin

packages/angular/cli/src/commands/mcp/tools/examples.ts

@@ -158,7 +158,12 @@ async function createFindExampleHandler({ exampleDatabasePath }: McpToolContext)
     if (whereClauses.length > 0) {
       sql += ` WHERE ${whereClauses.join(' AND ')}`;
     }
-    sql += ' ORDER BY rank;';
+
+    // Order the results by relevance using the BM25 algorithm.
+    // The weights assigned to each column boost the ranking of documents where the
+    // search term appears in a more important field.
+    // Column order: title, summary, keywords, required_packages, related_concepts, related_tools, content
+    sql += ' ORDER BY bm25(examples_fts, 10.0, 5.0, 5.0, 1.0, 2.0, 1.0, 1.0);';
 
     const queryStatement = db.prepare(sql);