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/scripts/build-binaries.ts

@@ -0,0 +1,49 @@
+/**
+ * Cross-platform single-binary compile.
+ *
+ * Run:  bun run scripts/build-binaries.ts
+ * Output:  dist/bin/claudemesh-{darwin,linux,windows}-{x64,arm64}{.exe}
+ *
+ * Each binary bundles the CLI + Bun runtime, no Node required.
+ * Current caveat: native deps like libsodium-wrappers ship as JS+wasm
+ * so they work. `ws` falls back to its JS polyfill when uws isn't present.
+ *
+ * Intended for CI — GitHub Releases publish → install.sh / Homebrew
+ * pull the right tarball per platform.
+ */
+
+import { mkdirSync } from "node:fs";
+import { spawnSync } from "node:child_process";
+
+const TARGETS: Array<{ name: string; target: string; ext: string }> = [
+  { name: "darwin-x64", target: "bun-darwin-x64", ext: "" },
+  { name: "darwin-arm64", target: "bun-darwin-arm64", ext: "" },
+  { name: "linux-x64", target: "bun-linux-x64", ext: "" },
+  { name: "linux-arm64", target: "bun-linux-arm64", ext: "" },
+  { name: "windows-x64", target: "bun-windows-x64", ext: ".exe" },
+];
+
+mkdirSync("dist/bin", { recursive: true });
+
+for (const { name, target, ext } of TARGETS) {
+  const out = `dist/bin/claudemesh-${name}${ext}`;
+  console.log(`→ ${out}`);
+  const res = spawnSync(
+    "bun",
+    [
+      "build",
+      "--compile",
+      "--minify",
+      `--target=${target}`,
+      "src/entrypoints/cli.ts",
+      "--outfile",
+      out,
+    ],
+    { stdio: "inherit" },
+  );
+  if (res.status !== 0) {
+    console.error(`  failed: ${name}`);
+    process.exit(1);
+  }
+}
+console.log("\nBinaries built in dist/bin/");