Feat: Implement governance pending mutation lifecycle

Added

- Runtime lifecycle manager support for governed mutation requests across pending, approval, cancellation, expiration, superseding, and execution transitions
- Governance-specific request exceptions for missing requests and invalid lifecycle transitions
- Runnable governance request lifecycle example covering pending queries, approval, cancellation, and expiration sweeps

Changed

- Request storage contracts now expose pending lookups by state and reason
- Example projects are now split between Core and Governance so governance samples live under their own path
- Governance runtime storage now follows the same folder-based structure as the rest of src

Result

Governed requests now exist as first-class deferred runtime objects instead of only immediate execution attempts. Pending request flows can be stored, listed, transitioned, and documented through decision history, with dedicated examples showing how the lifecycle behaves in practice.

Author: rian-be

Docs/Decision/Adr/ADR_024_Governance_Runtime_Pending_Request_Handling.md

@@ -8,7 +8,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <ProjectReference Include="..\..\src\ModularityKit.Mutator.csproj" />
+      <ProjectReference Include="..\..\..\src\ModularityKit.Mutator.csproj" />
     </ItemGroup>
 
     <ItemGroup>