feat: collapse mesh.name and mesh.slug into one identifier (v1.21.0)

Pre-launch fix: every visible surface already keyed on slug, so
"name" was a parallel string that only existed to confuse users
on rename ("I renamed but nothing visible changed").

Now slug IS the identifier. claudemesh rename <old> <new> is the
whole rename surface. PATCH /api/cli/meshes/:slug body becomes
{ slug } and the route writes both columns to keep them in sync.
Mesh create derives slug from input.name and stores name = slug.
Pickers drop the (parens). The claudemesh slug verb shipped 30
min ago is removed — merged into rename.

The mesh.name DB column stays for now to avoid touching ~25
reader sites; a follow-up migration drops it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/cli/src/commands/launch.ts

@@ -49,8 +49,7 @@ async function pickMesh(meshes: JoinedMesh[]): Promise<JoinedMesh> {
 
   console.log("\n  Select mesh:");
   meshes.forEach((m, i) => {
-    const label = m.name && m.name !== m.slug ? `${m.name}  \x1b[2m(${m.slug})\x1b[0m` : m.slug;
-    console.log(`    ${i + 1}) ${label}`);
+    console.log(`    ${i + 1}) ${m.slug}`);
   });
   console.log("");
 
@@ -219,9 +218,7 @@ async function runLaunchWizard(opts: {
     spinner.stop();
     const choice = await menuSelect({
       title: "Select mesh",
-      items: opts.meshes.map((m) =>
-        m.name && m.name !== m.slug ? `${m.name}  \x1b[2m(${m.slug})\x1b[0m` : m.slug,
-      ),
+      items: opts.meshes.map((m) => m.slug),
       row,
     });
     mesh = opts.meshes[choice]!;
@@ -229,8 +226,7 @@ async function runLaunchWizard(opts: {
     for (let i = 0; i < opts.meshes.length + 1; i++) {
       writeCentered(row + i, " ");
     }
-    const meshLabel = mesh.name && mesh.name !== mesh.slug ? `${mesh.name} (${mesh.slug})` : mesh.slug;
-    writeCentered(row, `Mesh      ${tGreen("✓")} ${meshLabel}`);
+    writeCentered(row, `Mesh      ${tGreen("✓")} ${mesh.slug}`);
     spinner.start();
     row++;
   }