feat: Introduce an AI-driven interactive shell mode with new

`read-shell` and `write-to-shell` tools and a configurable mode setting.

packages/cli/src/config/config.ts

@@ -1009,6 +1009,7 @@ export async function loadCliConfig(
     enableInteractiveShell: settings.tools?.shell?.enableInteractiveShell,
     shellBackgroundCompletionBehavior: settings.tools?.shell
       ?.backgroundCompletionBehavior as string | undefined,
+    interactiveShellMode: settings.tools?.shell?.interactiveShellMode,
     shellToolInactivityTimeout: settings.tools?.shell?.inactivityTimeout,
     enableShellOutputEfficiency:
       settings.tools?.shell?.enableShellOutputEfficiency ?? true,

packages/cli/src/config/settingsSchema.ts

@@ -1512,6 +1512,26 @@ const SETTINGS_SCHEMA = {
               { label: 'Notify', value: 'notify' },
             ],
           },
+          interactiveShellMode: {
+            type: 'enum',
+            label: 'Interactive Shell Mode',
+            category: 'Tools',
+            requiresRestart: true,
+            default: undefined as 'human' | 'ai' | 'off' | undefined,
+            description: oneLine`
+              Controls who can interact with backgrounded shell processes.
+              "human": user can Tab-focus and type into shells (default).
+              "ai": model gets write_to_shell/read_shell tools for TUI interaction.
+              "off": no interactive shell.
+              When set, overrides enableInteractiveShell.
+            `,
+            showInDialog: true,
+            options: [
+              { value: 'human', label: 'Human (Tab to focus)' },
+              { value: 'ai', label: 'AI (model-driven tools)' },
+              { value: 'off', label: 'Off' },
+            ],
+          },
           pager: {
             type: 'string',
             label: 'Pager',