fix(installer): prefix prompts.yml descriptions with entry name

The /prompts list in Rovo Dev only shows descriptions, making it hard
to identify entries. Prefix each description with the bmad entry name
so users see e.g. "bmad-bmm-create-prd - PRD workflow..." instead of
just the description text.

tools/cli/installers/lib/ide/rovodev.js

@@ -150,10 +150,10 @@ class RovoDevSetup extends BaseIdeSetup {
       }
     }
 
-    // Build new BMAD entries
+    // Build new BMAD entries (prefix description with name so /prompts list is scannable)
     const bmadEntries = writtenFiles.map((file) => ({
       name: file.name,
-      description: file.description,
+      description: `${file.name} - ${file.description}`,
       content_file: file.contentFile,
     }));