refactor(cli): move gh write adapters into the github module

Relocate github-mutations.ts to github/mutations.ts and export it from the
github barrel, so reads and writes live in one cohesive github/ module.
Routes import the write adapters via github/index.js. No behavior change.

Author: dastratakos

packages/cli/src/github/index.ts

@@ -1,2 +1,13 @@
+export {
+	addReviewers,
+	closePullRequest,
+	editTitle,
+	listCollaborators,
+	mergePullRequest,
+	removeReviewers,
+	reopenPullRequest,
+	setAutoMerge,
+	setDraft,
+} from "./mutations.js";
 export { getChecks, getMergeStatus, getPullRequest, getReviews } from "./pull-request.js";
 export { type GitHubRepo, isGitHubRemote, parseGitHubRepo } from "./repo.js";

packages/cli/src/github-mutations.ts packages/cli/src/github/mutations.tspackages/cli/src/github-mutations.ts renamed to packages/cli/src/github/mutations.ts

@@ -4,14 +4,14 @@ import {
 	PULL_REQUEST_MERGE_METHOD,
 	type PullRequestMergeMethod,
 } from "@stagereview/types/pull-request";
-import type { GitHubRepo } from "./github/index.js";
+import type { GitHubRepo } from "./repo.js";
 
 const execFileAsync = promisify(execFile);
 
 /**
  * Run a `gh` write command in `repoRoot`. Unlike the read adapters in
- * github.ts (which swallow errors to null), writes surface failures so the UI
- * can toast them — the user explicitly asked to mutate their PR.
+ * pull-request.ts (which swallow errors to null), writes surface failures so
+ * the UI can toast them — the user explicitly asked to mutate their PR.
  */
 async function ghWrite(args: string[], repoRoot: string): Promise<void> {
 	try {

packages/cli/src/routes/pull-request-mutations.ts

@@ -14,7 +14,7 @@ import {
 	reopenPullRequest,
 	setAutoMerge,
 	setDraft,
-} from "../github-mutations.js";
+} from "../github/index.js";
 import type { Route, RouteHandler } from "../server.js";
 import { readJsonBody, writeJson } from "./json.js";
 import { requireRepo, resolveRun } from "./pull-request-shared.js";