chore: bump version to v0.4.3

Includes hybrid architecture: parse command for agent consumption,
agent-native self-description skill, and lenient spec parsing.

Author: koriyoshi2041

package.json

@@ -1,6 +1,6 @@
 {
   "name": "agentify-cli",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "description": "Agent Interface Compiler — One command. Every agent speaks your product.",
   "type": "module",
   "bin": {