feat(memory): make directory search limit on memory discovery configurable with settings.json (#4460)

docs/cli/configuration.md

@@ -429,7 +429,7 @@ This example demonstrates how you can provide general project context, specific
       - Location: The CLI searches for the configured context file in the current working directory and then in each parent directory up to either the project root (identified by a `.git` folder) or your home directory.
       - Scope: Provides context relevant to the entire project or a significant portion of it.
   3.  **Sub-directory Context Files (Contextual/Local):**
-      - Location: The CLI also scans for the configured context file in subdirectories _below_ the current working directory (respecting common ignore patterns like `node_modules`, `.git`, etc.).
+      - Location: The CLI also scans for the configured context file in subdirectories _below_ the current working directory (respecting common ignore patterns like `node_modules`, `.git`, etc.). The breadth of this search is limited to 200 directories by default, but can be configured with a `memoryDiscoveryMaxDirs` field in your `settings.json` file.
       - Scope: Allows for highly specific instructions relevant to a particular component, module, or subsection of your project.
 - **Concatenation & UI Indication:** The contents of all found context files are concatenated (with separators indicating their origin and path) and provided as part of the system prompt to the Gemini model. The CLI footer displays the count of loaded context files, giving you a quick visual cue about the active instructional context.
 - **Commands for Memory Management:**