Support Enterprise automation account plans (#36228)

## What changed

- Recognize `enterprise_cbp_automation` as an Enterprise workspace plan in authentication, backend responses, and app-server account and rate-limit APIs.
- Expose the plan in generated protocol schemas and display it as `Enterprise (Automation)` in account status.
- Apply existing workspace eligibility and Business usage-limit behavior to the new plan.

## Testing

- Cover JWT parsing, plan conversion and serialization, app-server responses, workspace eligibility, usage-limit formatting, and TUI status rendering.

GitOrigin-RevId: d84ae2be3dd60fe398f226e6dc434efe27a387a5

codex-rs/protocol/src/auth.rs

@@ -77,6 +77,7 @@ impl PlanType {
             }
             "business" => Self::Known(KnownPlan::Business),
             "ent26" => Self::Known(KnownPlan::Ent26),
+            "enterprise_cbp_automation" => Self::Known(KnownPlan::EnterpriseCbpAutomation),
             "enterprise_cbp_usage_based" => Self::Known(KnownPlan::EnterpriseCbpUsageBased),
             "enterprise" | "hc" => Self::Known(KnownPlan::Enterprise),
             "education" | "edu" => Self::Known(KnownPlan::Edu),
@@ -100,6 +101,8 @@ pub enum KnownPlan {
     SelfServeBusinessUsageBased,
     Business,
     Ent26,
+    #[serde(rename = "enterprise_cbp_automation")]
+    EnterpriseCbpAutomation,
     #[serde(rename = "enterprise_cbp_usage_based")]
     EnterpriseCbpUsageBased,
     #[serde(alias = "hc")]
@@ -121,6 +124,7 @@ impl KnownPlan {
             Self::SelfServeBusinessUsageBased => "Self Serve Business Usage Based",
             Self::Business => "Business",
             Self::Ent26 => "Enterprise",
+            Self::EnterpriseCbpAutomation => "Enterprise (Automation)",
             Self::EnterpriseCbpUsageBased => "Enterprise CBP Usage Based",
             Self::Enterprise => "Enterprise",
             Self::Edu => "Edu",
@@ -139,6 +143,7 @@ impl KnownPlan {
             Self::SelfServeBusinessUsageBased => "self_serve_business_usage_based",
             Self::Business => "business",
             Self::Ent26 => "ent26",
+            Self::EnterpriseCbpAutomation => "enterprise_cbp_automation",
             Self::EnterpriseCbpUsageBased => "enterprise_cbp_usage_based",
             Self::Enterprise => "enterprise",
             Self::Edu => "edu",
@@ -153,6 +158,7 @@ impl KnownPlan {
                 | Self::SelfServeBusinessUsageBased
                 | Self::Business
                 | Self::Ent26
+                | Self::EnterpriseCbpAutomation
                 | Self::EnterpriseCbpUsageBased
                 | Self::Enterprise
                 | Self::Edu
@@ -201,5 +207,10 @@ mod tests {
                 .expect("education should deserialize"),
             PlanType::Known(KnownPlan::Edu)
         );
+        assert_eq!(
+            serde_json::from_str::<PlanType>("\"enterprise_cbp_automation\"")
+                .expect("enterprise cbp automation should deserialize"),
+            PlanType::Known(KnownPlan::EnterpriseCbpAutomation)
+        );
     }
 }