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>

packages/api/src/modules/mesh/mutations.ts

@@ -136,10 +136,13 @@ export const createMyMesh = async ({
     s.base64_variants.URLSAFE_NO_PADDING,
   );
 
+  // v0.7.0 collapse: mesh.name always == mesh.slug. Input.name is
+  // accepted from create UIs (dashboard, CLI) and used to derive the
+  // slug; we drop the original spelling so name and slug never drift.
   const [created] = await db
     .insert(mesh)
     .values({
-      name: input.name,
+      name: slug,
       slug,
       visibility: input.visibility,
       transport: input.transport,