add schedule & workflow dispatch paths. Also make prepare logic conditional

src/prepare/types.ts

@@ -0,0 +1,20 @@
+import type { ParsedGitHubContext } from "../github/context";
+import type { Octokits } from "../github/api/client";
+import type { Mode } from "../modes/types";
+
+export type PrepareResult = {
+  commentId?: number;
+  branchInfo: {
+    baseBranch: string;
+    claudeBranch?: string;
+    currentBranch: string;
+  };
+  mcpConfig: string;
+};
+
+export type PrepareOptions = {
+  context: ParsedGitHubContext;
+  octokit: Octokits;
+  mode: Mode;
+  githubToken: string;
+};