feat(cli): add --agents-allowed to template commands (#27517)

Relates to CODAGT-713

Depends on #27515

This adds `--agents-allowed` to `coder templates create` and `coder templates edit`. Template creation defaults the option to true, matching the per-template API and database default, while template editing only changes the value when the flag is explicitly supplied so unrelated edits preserve the existing setting.

The generated CLI help and reference documentation include the new option. #27518 updates the Coder Agents platform controls documentation to describe the completed per-template model.

cli/templateedit.go

@@ -33,6 +33,7 @@ func (r *RootCmd) templateEdit() *serpent.Command {
 		allowUserCancelWorkspaceJobs   bool
 		allowUserAutostart             bool
 		allowUserAutostop              bool
+		agentsAllowed                  bool
 		requireActiveVersion           bool
 		deprecationMessage             string
 		disableEveryone                bool
@@ -142,6 +143,10 @@ func (r *RootCmd) templateEdit() *serpent.Command {
 				dormancyAutoDeletion = time.Duration(template.TimeTilDormantAutoDeleteMillis) * time.Millisecond
 			}
 
+			if !userSetOption(inv, "agents-allowed") {
+				agentsAllowed = template.AgentsAllowed
+			}
+
 			if !userSetOption(inv, "require-active-version") {
 				requireActiveVersion = template.RequireActiveVersion
 			}
@@ -199,6 +204,7 @@ func (r *RootCmd) templateEdit() *serpent.Command {
 				AllowUserCancelWorkspaceJobs:   &allowUserCancelWorkspaceJobs,
 				AllowUserAutostart:             &allowUserAutostart,
 				AllowUserAutostop:              &allowUserAutostop,
+				AgentsAllowed:                  &agentsAllowed,
 				RequireActiveVersion:           &requireActiveVersion,
 				DeprecationMessage:             deprecated,
 				DisableEveryoneGroupAccess:     &disableEveryoneGroup,
@@ -292,6 +298,12 @@ func (r *RootCmd) templateEdit() *serpent.Command {
 			Default:     "0h",
 			Value:       serpent.DurationOf(&dormancyAutoDeletion),
 		},
+		{
+			Flag:        "agents-allowed",
+			Description: "Allow Coder Agents to create workspaces using this template.",
+			Default:     "true",
+			Value:       serpent.BoolOf(&agentsAllowed),
+		},
 		{
 			Flag:        "allow-user-cancel-workspace-jobs",
 			Description: "Allow users to cancel in-progress workspace jobs.",