feat: add boundary premium feature (#21589)

Source code changes:

- Added a wrapper for the boundary subcommand that checks feature
entitlement before executing the underlying command.
- Added a helper that returns the Boundary version using the
runtime/debug package, which reads this information from the go.mod
file.
- Added FeatureBoundary to the corresponding enum.
- Move boundary command from AGPL to enterprise.

`NOTE`: From now on, the Boundary version will be specified in go.mod
instead of being defined in AI modules.

cli/root.go

@@ -151,7 +151,6 @@ func (r *RootCmd) AGPLExperimental() []*serpent.Command {
 		r.promptExample(),
 		r.rptyCommand(),
 		r.syncCommand(),
-		r.boundary(),
 	}
 }
 
@@ -333,6 +332,12 @@ func (r *RootCmd) Command(subcommands []*serpent.Command) (*serpent.Command, err
 					// support links.
 					return
 				}
+				if cmd.Name() == "boundary" {
+					// The boundary command is integrated from the boundary package
+					// and has YAML-only options (e.g., allowlist from config file)
+					// that don't have flags or env vars.
+					return
+				}
 				merr = errors.Join(
 					merr,
 					xerrors.Errorf("option %q in %q should have a flag or env", opt.Name, cmd.FullName()),