fix: remove invalid empty version fields from workspace packages

Removes `"version": ""` from internal workspace packages to fix
changesets validation errors. These private packages don't need
explicit version fields as they use workspace protocol.

Fixes validation errors:
- Package "task-master-ai" must depend on the current version of "@tm/ai-sdk-provider-grok-cli": "" vs "*"
- Package "task-master-ai" must depend on the current version of "@tm/cli": "" vs "*"
- Package "@tm/cli" must depend on the current version of "@tm/core": "" vs "*"
- Package "extension" must depend on the current version of "@tm/core": "" vs "*"
- Package "@tm/mcp" must depend on the current version of "@tm/core": "" vs "*"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/cli/package.json

@@ -49,6 +49,5 @@
 		"*": {
 			"*": ["src/*"]
 		}
-	},
-	"version": ""
+	}
 }

apps/mcp/package.json

@@ -3,7 +3,6 @@
 	"description": "Task Master MCP Tools - TypeScript MCP server tools for AI agent integration",
 	"type": "module",
 	"private": true,
-	"version": "",
 	"main": "./dist/index.js",
 	"types": "./src/index.ts",
 	"exports": {