[codex] remove EnvironmentPathRef (#27433)

We're switching to using a static encoding of the host path in
`PathUri`. We may need a type like this again but we can add it when
it's more compelling.

Stacked on #27454.

codex-rs/ext/skills/src/catalog.rs

@@ -1,5 +1,5 @@
 use codex_core_skills::model::SkillDependencies;
-use codex_exec_server::EnvironmentPathRef;
+use codex_utils_absolute_path::AbsolutePathBuf;
 
 /// Source authority that owns a skill package and must be used to read it.
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
@@ -62,7 +62,7 @@ pub struct SkillPackageId(pub String);
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct SkillResourceId {
     id: String,
-    environment_path: Option<EnvironmentPathRef>,
+    environment_path: Option<EnvironmentSkillResource>,
 }
 
 impl SkillResourceId {
@@ -73,10 +73,17 @@ impl SkillResourceId {
         }
     }
 
-    pub fn environment(id: impl Into<String>, path: EnvironmentPathRef) -> Self {
+    pub fn environment(
+        id: impl Into<String>,
+        environment_id: impl Into<String>,
+        path: AbsolutePathBuf,
+    ) -> Self {
         Self {
             id: id.into(),
-            environment_path: Some(path),
+            environment_path: Some(EnvironmentSkillResource {
+                environment_id: environment_id.into(),
+                path,
+            }),
         }
     }
 
@@ -84,11 +91,19 @@ impl SkillResourceId {
         &self.id
     }
 
-    pub(crate) fn environment_path(&self) -> Option<&EnvironmentPathRef> {
-        self.environment_path.as_ref()
+    pub(crate) fn environment_path(&self) -> Option<(&str, &AbsolutePathBuf)> {
+        self.environment_path
+            .as_ref()
+            .map(|resource| (resource.environment_id.as_str(), &resource.path))
     }
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct EnvironmentSkillResource {
+    environment_id: String,
+    path: AbsolutePathBuf,
+}
+
 /// Metadata shown in the always-visible skills catalog.
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct SkillCatalogEntry {