chore(go): audit providers copilot droid augment cline

Move the four providers onto managed_runtime.go and shell_command.go;
keep the Auggie wrappers, Cline metadata wrappers, and the Copilot and
Droid precondition handling provider-local.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

cmd/elydora/plugins/cline.go

@@ -7,8 +7,7 @@ type ClinePlugin struct {
 	rename renameFunc
 }
 
-// ManagesGuardRuntime reports that Cline commits both generated runtimes and
-// both native hook files in one transaction.
+// ManagesGuardRuntime reports that the guard is committed with the audit runtime.
 func (p *ClinePlugin) ManagesGuardRuntime() bool {
 	return true
 }