fix: ensure bin entry points are executable after build

tsc doesn't preserve the executable bit from source files, which
means bin entry points won't work when the package is installed
via npm workspaces (unlike registry installs, where npm sets +x
automatically).

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

Author: arbrandes

Makefile

@@ -16,6 +16,10 @@ clean:
 build:
 	tsc --build ./tsconfig.build.json
 	cp ./shell/app.scss ./dist/shell/app.scss
+	# When the package is installed from the registry, NPM sets the executable
+	# bit on `bin` files automatically. It doesn't do the same in workspaces,
+	# though, so we handle it explicitly here.
+	chmod a+x $$(node -p "Object.values(require('./package.json').bin).join(' ')")
 
 docs-build:
 	${doc_command}