chore(cli-v2): un-ignore CLI source tree for binary release workflow

The CLI source (242 files, ~14k lines) was gitignored during the
earlier cli→cli-v2 reorg so only the published npm package carried it.
That blocks the GitHub Actions release workflow (release-cli.yml),
which clones the repo fresh on each runner and needs the source to
compile binaries via `bun build --compile`.

Moves the gitignore from root-level to `apps/cli-v2/.gitignore` with
only the usual build artefacts excluded (node_modules, dist, .turbo,
.cache). Source is now in git at apps/cli-v2/src/.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/cli-v2/src/commands/rename.ts

@@ -0,0 +1,14 @@
+import { rename as renameMesh } from "~/services/mesh/facade.js";
+import { green, icons } from "~/ui/styles.js";
+import { EXIT } from "~/constants/exit-codes.js";
+
+export async function rename(slug: string, newName: string): Promise<number> {
+  try {
+    await renameMesh(slug, newName);
+    console.log(`  ${green(icons.check)} Renamed "${slug}" to "${newName}"`);
+    return EXIT.SUCCESS;
+  } catch (err) {
+    console.error(`  ${icons.cross} Failed: ${err instanceof Error ? err.message : err}`);
+    return EXIT.INTERNAL_ERROR;
+  }
+}