feat(macp): add registerMacpCommand for mosaic macp CLI surface

Adds mosaic macp tasks list|submit|gate|events tail subcommands to
@mosaicstack/macp, wires registerMacpCommand into the root mosaic CLI,
and ships a smoke test asserting command structure without touching disk
or starting an event emitter. Ref CU-05-08.

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",