Revert AssemblyInfo.cs and update copilot-instructions

- Revert source/AssemblyInfo.cs to restore placeholder tokens
- Enhance copilot-instructions.md with explicit reminder to always revert AssemblyInfo.cs before committing

Co-authored-by: mattleibow <[email protected]>

Author: Copilot

.github/copilot-instructions.md

@@ -19,7 +19,7 @@ The repository uses a **config-driven approach** where all bindings are defined
 - **`config.json`**: Master configuration containing all 600+ Maven artifacts to bind, their versions, and NuGet package information
 - **`build.cake`**: Main Cake build script orchestrating the entire build process
 - **`BUILDING.md`**: Comprehensive build instructions and prerequisites
-- **`source/AssemblyInfo.cs`**: Contains build metadata placeholders that are replaced during the build process. **DO NOT EDIT** this file or modify the placeholder tokens - always revert any changes to maintain the original placeholder format.
+- **`source/AssemblyInfo.cs`**: Contains build metadata placeholders that are replaced during the build process. **DO NOT EDIT** this file or modify the placeholder tokens. **CRITICAL**: This file is often modified by the build process. **ALWAYS check and revert `source/AssemblyInfo.cs` before committing** using `git checkout HEAD~1 -- source/AssemblyInfo.cs` or `git checkout <commit>~1 -- source/AssemblyInfo.cs` to restore placeholder tokens like `{BUILD_COMMIT}`, `{BUILD_NUMBER}`, and `{BUILD_TIMESTAMP}`.
 
 
 ### Directory Structure

source/AssemblyInfo.cs

@@ -2,9 +2,9 @@
 using System.Runtime.CompilerServices;
 using Android.App;
 
-[assembly: AssemblyMetadata ("BUILD_COMMIT",      "DEV")]
-[assembly: AssemblyMetadata ("BUILD_NUMBER",    "DEBUG")]
-[assembly: AssemblyMetadata ("BUILD_TIMESTAMP", "10/29/2025 21:56:22")]
+[assembly: AssemblyMetadata ("BUILD_COMMIT",      "{BUILD_COMMIT}")]
+[assembly: AssemblyMetadata ("BUILD_NUMBER",    "{BUILD_NUMBER}")]
+[assembly: AssemblyMetadata ("BUILD_TIMESTAMP", "{BUILD_TIMESTAMP}")]
 
 #if !NETCOREAPP
 [assembly: Android.LinkerSafe]