Add content synchronization instructions

.github/copilot-instructions.md

@@ -1,3 +1,4 @@
+````instructions
 # GitHub Copilot Instructions
 
 **Never use the unicode multiplication symbol (×, U+00D7) in any documentation, code, or markdown.**
@@ -28,6 +29,21 @@ All challenge pages must include the following tags:
 ## Visibility Tags
 - `hidden`: Use this tag to prevent the page from being published to the fargo3d.com website.
 
+# Content Synchronization
+
+The `wiki-fargo3d` submodule contains the official documentation. Some content is mirrored in the main repository root.
+
+- **Readme.md vs wiki-fargo3d/Home.md**: Keep announcements and general descriptions in sync.
+- **challenges.md vs wiki-fargo3d/Current-Challenge.md**: `challenges.md` should reflect the active challenge found in the wiki.
+- **itinerary.md vs wiki-fargo3d/Itinerary.md**: Keep meeting schedules in sync.
+
+## Git Workflow for Wiki Updates
+1. Make changes in `wiki-fargo3d/`.
+2. Commit and push changes in `wiki-fargo3d`.
+3. Go to root `P:\3dPrintMeetup`.
+4. Commit the submodule update.
+5. Push root changes.
+
 ## Example Front Matter
 
 ```yaml
@@ -37,3 +53,4 @@ tags:
  - challenge-002
 ---
 ```
+````