chore: remove unused legacy macOS permission types (#13677)

## Summary

This PR removes legacy macOS permission model types from
`codex-rs/protocol/src/models.rs`:

- `MacOsPermissions`
- `MacOsPreferencesValue`
- `MacOsAutomationValue`

The protocol now relies on the current `MacOsSeatbeltProfileExtensions`
model for macOS permission data.

codex-rs/protocol/src/models.rs

@@ -67,23 +67,6 @@ impl FileSystemPermissions {
     }
 }
 
-#[derive(Debug, Clone, Default, Eq, Hash, PartialEq, Serialize, Deserialize, JsonSchema, TS)]
-pub struct MacOsPermissions {
-    pub preferences: Option<MacOsPreferencesValue>,
-    pub automations: Option<MacOsAutomationValue>,
-    pub accessibility: Option<bool>,
-    pub calendar: Option<bool>,
-}
-
-impl MacOsPermissions {
-    pub fn is_empty(&self) -> bool {
-        self.preferences.is_none()
-            && self.automations.is_none()
-            && self.accessibility.is_none()
-            && self.calendar.is_none()
-    }
-}
-
 #[derive(Debug, Clone, Default, Eq, Hash, PartialEq, Serialize, Deserialize, JsonSchema, TS)]
 pub struct NetworkPermissions {
     pub enabled: Option<bool>,
@@ -95,20 +78,6 @@ impl NetworkPermissions {
     }
 }
 
-#[derive(Debug, Clone, Eq, Hash, PartialEq, Serialize, Deserialize, JsonSchema, TS)]
-#[serde(untagged)]
-pub enum MacOsPreferencesValue {
-    Bool(bool),
-    Mode(String),
-}
-
-#[derive(Debug, Clone, Eq, Hash, PartialEq, Serialize, Deserialize, JsonSchema, TS)]
-#[serde(untagged)]
-pub enum MacOsAutomationValue {
-    Bool(bool),
-    BundleIds(Vec<String>),
-}
-
 #[derive(
     Debug,
     Clone,