commands: hide Git credential helper actions from --help

`get`, `store`, `erase`, and `capability` are entry points used by
Git itself over the credential helper protocol. They are not
user-facing commands: invoking them by hand requires writing the
key=value protocol on standard input, and they have no useful
behaviour outside of being called by Git. Listing them in
`git-credential-manager --help` is just noise that distracts from
the commands a human actually runs (configure, unconfigure,
diagnose, and the per-provider subcommands).

Set IsHidden = true on each of the four commands. They remain
fully invokable (Git's calls are unaffected), they just no longer
appear in the top-level help listing.

Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>
Assisted-by: Claude Opus 4.7

Author: mjcheetham

src/Core/Commands/CapabilityCommand.cs

@@ -41,6 +41,8 @@ public CapabilityCommand(ICommandContext context)
         EnsureArgument.NotNull(context, nameof(context));
         _context = context;
 
+        IsHidden = true;
+
         this.SetHandler(Execute);
     }
 

src/Core/Commands/EraseCommand.cs

@@ -8,7 +8,10 @@ namespace GitCredentialManager.Commands
     public class EraseCommand : GitCommandBase
     {
         public EraseCommand(ICommandContext context, IHostProviderRegistry hostProviderRegistry)
-            : base(context, "erase", "[Git] Erase a stored credential", hostProviderRegistry) { }
+            : base(context, "erase", "[Git] Erase a stored credential", hostProviderRegistry)
+        {
+            IsHidden = true;
+        }
 
         protected override Task ExecuteInternalAsync(GitRequest request, IHostProvider provider)
         {

src/Core/Commands/GetCommand.cs

@@ -11,7 +11,10 @@ namespace GitCredentialManager.Commands
     public class GetCommand : GitCommandBase
     {
         public GetCommand(ICommandContext context, IHostProviderRegistry hostProviderRegistry)
-            : base(context, "get", "[Git] Return a stored credential", hostProviderRegistry) { }
+            : base(context, "get", "[Git] Return a stored credential", hostProviderRegistry)
+        {
+            IsHidden = true;
+        }
 
         protected override async Task ExecuteInternalAsync(GitRequest request, IHostProvider provider)
         {

src/Core/Commands/StoreCommand.cs

@@ -9,7 +9,10 @@ namespace GitCredentialManager.Commands
     public class StoreCommand : GitCommandBase
     {
         public StoreCommand(ICommandContext context, IHostProviderRegistry hostProviderRegistry)
-            : base(context, "store", "[Git] Store a credential", hostProviderRegistry) { }
+            : base(context, "store", "[Git] Store a credential", hostProviderRegistry)
+        {
+            IsHidden = true;
+        }
 
         protected override Task ExecuteInternalAsync(GitRequest request, IHostProvider provider)
         {