feat(cli): add mesh templates and claudemesh create command

Predefined mesh configurations (dev-team, research, ops-incident,
simulation, personal) let users bootstrap meshes with groups, roles,
state keys, and system prompt hints. Templates are bundled at build
time via Bun's JSON import support.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/cli/src/templates/personal.json

@@ -0,0 +1,11 @@
+{
+  "name": "personal",
+  "description": "Private mesh for a single user — all sessions auto-join",
+  "groups": [],
+  "stateKeys": {
+    "focus": "",
+    "todos": "[]"
+  },
+  "suggestedRoles": [],
+  "systemPromptHint": "Personal workspace. All your Claude Code sessions share this mesh. Use state keys to track focus and todos across sessions."
+}