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/leave.ts

@@ -0,0 +1,25 @@
+/**
+ * `claudemesh leave <slug>` — remove a mesh from local config.
+ *
+ * Does NOT (yet) notify the broker. In 15b+ this will send a
+ * best-effort revoke request before removing the entry.
+ */
+
+import { readConfig, writeConfig } from "~/services/config/facade.js";
+
+export function runLeave(args: string[]): void {
+  const slug = args[0];
+  if (!slug) {
+    console.error("Usage: claudemesh leave <slug>");
+    process.exit(1);
+  }
+  const config = readConfig();
+  const before = config.meshes.length;
+  config.meshes = config.meshes.filter((m) => m.slug !== slug);
+  if (config.meshes.length === before) {
+    console.error(`claudemesh: no joined mesh with slug "${slug}"`);
+    process.exit(1);
+  }
+  writeConfig(config);
+  console.log(`Left mesh "${slug}". Remaining: ${config.meshes.length}`);
+}