Fix pi-agent CLI execution issue when installed globally

- Remove isMainModule check that was preventing execution via npm symlink
- CLI now runs main function directly when executed
- Bump version to 0.5.1

package-lock.json

@@ -778,7 +778,7 @@
 		},
 		"packages/agent": {
 			"name": "@mariozechner/pi-agent",
-			"version": "0.5.0",
+			"version": "0.5.1",
 			"license": "MIT",
 			"dependencies": {
 				"@mariozechner/pi-tui": "^0.5.0",
@@ -1222,7 +1222,7 @@
 		},
 		"packages/pods": {
 			"name": "@mariozechner/pi",
-			"version": "0.5.0",
+			"version": "0.5.1",
 			"license": "MIT",
 			"dependencies": {
 				"@mariozechner/pi-agent": "^0.5.0",
@@ -1238,7 +1238,7 @@
 		},
 		"packages/tui": {
 			"name": "@mariozechner/pi-tui",
-			"version": "0.5.0",
+			"version": "0.5.1",
 			"license": "MIT",
 			"dependencies": {
 				"@types/mime-types": "^2.1.4",