docs: add workspace command execution guidelines

Add a new section to monorepo documentation that clarifies how to execute
commands in specific workspaces using the cwd parameter.

This helps models understand the importance of specifying the correct
workspace context when running commands in the monorepo structure.

Fixes: #4298
Signed-off-by: Eric Wheeler <[email protected]>

Author: Eric Wheeler

.roo/rules/monorepo.md

@@ -49,3 +49,7 @@
     1. Move any failing tests → `name.spec.ts`
     2. Add new tests → `name.spec.ts`
     3. Leave successful tests in `.test.ts`
+
+# Executing package specific commands
+
+Any time you are using a workspace to run commands, you must always specify `<cwd>workspace/directory</cwd>`