feat(forge): add registerForgeCommand for mosaic forge CLI surface

Adds mosaic forge run|status|resume|personas list subcommands to
@mosaicstack/forge, wires registerForgeCommand into the root mosaic CLI,
and ships a smoke test asserting command structure. Ref CU-05-01
cli-unification-20260404.

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

packages/forge/package.json

@@ -26,7 +26,8 @@
     "test": "vitest run --passWithNoTests"
   },
   "dependencies": {
-    "@mosaicstack/macp": "workspace:*"
+    "@mosaicstack/macp": "workspace:*",
+    "commander": "^13.0.0"
   },
   "devDependencies": {
     "@types/node": "^22.0.0",