fix(cli): v0.1.8 — remove Zod dependency (bun bundler crash)

Replace Zod schemas with plain TypeScript validation in env.ts,
config.ts, and invite/parse.ts. Zod 4 classes break under bun
build --target=node (Class2 is not a constructor).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.1.7",
+  "version": "0.1.8",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",