Remove the now-redundant gitCmdObjBuilder wrapper

The wrapper existed to add a git-specific env var to every command. Now
that that's gone, its New/NewShell/Quote methods just delegated to the
inner builder. The only remaining git-specific behavior — the command
runner — is attached in the constructor via CloneWithNewRunner, which
already returns a complete builder, so we can return that directly and
drop the wrapper struct.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pkg/commands/git_cmd_obj_builder.go

@@ -5,37 +5,16 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-// all we're doing here is wrapping the default command object builder with
-// some git-specific stuff: e.g. adding a git-specific env var
-
-type gitCmdObjBuilder struct {
-	innerBuilder *oscommands.CmdObjBuilder
-}
-
-var _ oscommands.ICmdObjBuilder = &gitCmdObjBuilder{}
-
-func NewGitCmdObjBuilder(log *logrus.Entry, innerBuilder *oscommands.CmdObjBuilder) *gitCmdObjBuilder {
-	// the price of having a convenient interface where we can say .New(...).Run() is that our builder now depends on our runner, so when we want to wrap the default builder/runner in new functionality we need to jump through some hoops. We could avoid the use of a decorator function here by just exporting the runner field on the default builder but that would be misleading because we don't want anybody using that to run commands (i.e. we want there to be a single API used across the codebase)
-	updatedBuilder := innerBuilder.CloneWithNewRunner(func(runner oscommands.ICmdObjRunner) oscommands.ICmdObjRunner {
+// NewGitCmdObjBuilder returns a command object builder whose runner is wrapped
+// with our git-specific runner (logging, credential handling, etc.).
+func NewGitCmdObjBuilder(log *logrus.Entry, innerBuilder *oscommands.CmdObjBuilder) *oscommands.CmdObjBuilder {
+	// We decorate the runner rather than exposing the builder's runner field:
+	// that field stays unexported so there's a single API for running commands
+	// across the codebase.
+	return innerBuilder.CloneWithNewRunner(func(runner oscommands.ICmdObjRunner) oscommands.ICmdObjRunner {
 		return &gitCmdObjRunner{
 			log:         log,
 			innerRunner: runner,
 		}
 	})
-
-	return &gitCmdObjBuilder{
-		innerBuilder: updatedBuilder,
-	}
-}
-
-func (self *gitCmdObjBuilder) New(args []string) *oscommands.CmdObj {
-	return self.innerBuilder.New(args)
-}
-
-func (self *gitCmdObjBuilder) NewShell(cmdStr string, shellFunctionsFile string) *oscommands.CmdObj {
-	return self.innerBuilder.NewShell(cmdStr, shellFunctionsFile)
-}
-
-func (self *gitCmdObjBuilder) Quote(str string) string {
-	return self.innerBuilder.Quote(str)
 }