feat: migrate pmg to nx based release automation (#293)

* feat: Migrate release system to Nx with platform-specific npm packages

* add go.work.sum

* fix: CI deprecations, stale action pins, and signal propagation

* fix: update e2e workflows to pnpm 11 and latest action SHAs

* fix: update pmg-e2e.yml to Node 24 with Go and pnpm caching

* fix: resolve E2E failures, remove goreleaser-test, update action SHAs

* fix: restore goreleaser-test (required check)

* fix: escape pnpm workspace detection for yarn/pnpx tests, update action versions

.gitignore

@@ -17,9 +17,6 @@
 # Dependency directories (remove the comment below to include it)
 # vendor/
 
-# Go workspace file
-go.work
-go.work.sum
 bin/
 
 # env file
@@ -27,3 +24,14 @@ bin/
 
 dist/
 .DS_Store
+
+# Nx
+.nx/
+node_modules/
+
+# Platform package binaries (populated by sync-binaries at build time)
+packages/*/bin/
+
+# Build artifacts in wrapper package
+packages/pmg/dist/
+packages/pmg/README.md