feat: add multi-model cleanup tool and CLI command

- Bump `@opencode-ai/plugin` dependency from 1.2.27 to 1.3.0.
- Introduce `cleanup` command in CLI with force and remote options.
- Export `cleanupMultiModel` from core index.
- Register `multi-model-cleanup` tool in plugin and update exports.
- Add `CleanupOptions` and `CleanupResult` types to define cleanup behavior and results.

src/types.ts

@@ -74,6 +74,45 @@ export interface WindowLaunchPlan {
   windowName: string;
 }
 
+/**
+ * Options for cleaning up archive tags.
+ */
+export interface CleanupOptions {
+  /** Skip confirmation prompts. */
+  force?: boolean;
+  /**
+   * Remote name to push deletions to.
+   * - If string: use specified remote (error if doesn't exist)
+   * - If undefined: use first available remote from git remote -v
+   * - If false: only local cleanup (--no-remote flag)
+   */
+  remote?: string | false;
+}
+
+/**
+ * Result returned after attempting to cleanup archive tags.
+ */
+export interface CleanupResult {
+  /** Whether the cleanup succeeded. */
+  success: boolean;
+  /** Error message if the cleanup failed. */
+  error?: string;
+  /** Summary message for the user. */
+  instructions?: string;
+  /** Number of local tags deleted. */
+  localTagsDeleted: number;
+  /** Number of remote tags deleted. */
+  remoteTagsDeleted: number;
+  /** Names of tags that were deleted locally. */
+  localTagNames: string[];
+  /** Names of tags deleted from remote. */
+  remoteTagNames: string[];
+  /** Tags that failed remote deletion. */
+  remoteTagErrors: Array<{ tag: string; error: string }>;
+  /** Available remotes discovered. */
+  availableRemotes: string[];
+}
+
 /**
  * Result of running a shell command.
  */