Add native glob file discovery

docs/USER_GUIDE.md

@@ -57,9 +57,9 @@ the same safe rebuild manually.
 The coding agent can use native tools to list a directory, read files, search
 file contents, write or edit files, inspect Git state, and maintain Dev Brain.
 It can also run shell commands and use web search or visit pages when the task
-needs them. Content search is not filename discovery: until DS4Server ships a
-native filename glob tool, recursive filename lookup may require an approved
-shell command. A directory listing remains a non-recursive view of one folder.
+needs them. The native glob tool finds files recursively by basename or relative
+path pattern without a shell; content matching remains the search tool's job,
+and a directory listing remains a non-recursive view of one folder.
 
 Tool calls are checked against typed schemas before execution. Unknown tools,
 missing or extra fields, malformed calls, and invalid values return structured