feat: add required mode flag to cleanup and close

- Made `mode` a mandatory property in `MultiModelOptions`, `CloseSessionOptions`, and `CleanupOptions`.
- Updated function signatures to accept `mode` and removed default empty option objects where appropriate.
- Passed `mode: "cli"` from CLI commands and `mode: "tool"` from tool commands to cleanup, close, and open operations.
- Adjusted internal handling to use the provided `mode` (removed fallback defaults).
- Updated type definitions and added documentation for the new `mode` field.

src/types.ts

@@ -9,7 +9,7 @@ export interface MultiModelOptions {
   /** Binary name to use ('opencode' or 'kilo'). Defaults to 'opencode'. */
   binaryName?: string;
   /** Caller context: 'cli' shows shell commands, 'tool' shows tool instructions. */
-  mode?: "cli" | "tool";
+  mode: "cli" | "tool";
 }
 
 /**
@@ -40,6 +40,8 @@ export interface CloseSessionOptions {
   cleanupWorktrees?: boolean;
   /** Skip confirmation prompts. */
   force?: boolean;
+  /** Caller context: 'cli' shows shell commands, 'tool' shows tool instructions. */
+  mode: "cli" | "tool";
 }
 
 /**
@@ -87,6 +89,8 @@ export interface CleanupOptions {
    * - If false: only local cleanup (--no-remote flag)
    */
   remote?: string | false;
+  /** Caller context: 'cli' shows shell commands, 'tool' shows tool instructions. */
+  mode: "cli" | "tool";
 }
 
 /**