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/tests/unit/argv.test.ts

@@ -0,0 +1,42 @@
+import { describe, it, expect } from "vitest";
+import { parseArgv } from "~/cli/argv.js";
+
+describe("parseArgv", () => {
+  it("parses bare command", () => {
+    const r = parseArgv(["node", "cli.js", "login"]);
+    expect(r.command).toBe("login");
+    expect(r.positionals).toEqual([]);
+    expect(r.flags).toEqual({});
+  });
+
+  it("parses command with positionals", () => {
+    const r = parseArgv(["node", "cli.js", "send", "alice", "hello world"]);
+    expect(r.command).toBe("send");
+    expect(r.positionals).toEqual(["alice", "hello world"]);
+  });
+
+  it("parses flags before command", () => {
+    const r = parseArgv(["node", "cli.js", "--version"]);
+    expect(r.command).toBe("");
+    expect(r.flags.version).toBe(true);
+  });
+
+  it("parses flags with values", () => {
+    const r = parseArgv(["node", "cli.js", "peers", "--mesh", "my-team", "--json"]);
+    expect(r.command).toBe("peers");
+    expect(r.flags.mesh).toBe("my-team");
+    expect(r.flags.json).toBe(true);
+  });
+
+  it("parses short flags", () => {
+    const r = parseArgv(["node", "cli.js", "-y", "-q"]);
+    expect(r.flags.y).toBe(true);
+    expect(r.flags.q).toBe(true);
+  });
+
+  it("empty args", () => {
+    const r = parseArgv(["node", "cli.js"]);
+    expect(r.command).toBe("");
+    expect(r.positionals).toEqual([]);
+  });
+});