Use AbsolutePathBuf in skill loading and codex_home (#17407)

Helps with FS migration later

codex-rs/codex-mcp/Cargo.toml

@@ -35,6 +35,7 @@ tracing = { workspace = true }
 url = { workspace = true }
 
 [dev-dependencies]
+codex-utils-absolute-path = { workspace = true }
 pretty_assertions = { workspace = true }
 rmcp = { workspace = true, default-features = false, features = ["base64", "macros", "schemars", "server"] }
 tempfile = { workspace = true }

codex-rs/codex-mcp/src/mcp/skill_dependencies_tests.rs

@@ -2,8 +2,9 @@ use super::*;
 use codex_protocol::protocol::SkillDependencies;
 use codex_protocol::protocol::SkillMetadata;
 use codex_protocol::protocol::SkillScope;
+use codex_utils_absolute_path::test_support::PathBufExt as _;
+use codex_utils_absolute_path::test_support::test_path_buf;
 use pretty_assertions::assert_eq;
-use std::path::PathBuf;
 
 fn skill_with_tools(tools: Vec<SkillToolDependency>) -> SkillMetadata {
     SkillMetadata {
@@ -12,7 +13,7 @@ fn skill_with_tools(tools: Vec<SkillToolDependency>) -> SkillMetadata {
         short_description: None,
         interface: None,
         dependencies: Some(SkillDependencies { tools }),
-        path: PathBuf::from("skill"),
+        path: test_path_buf("/tmp/skill").abs(),
         scope: SkillScope::User,
         enabled: true,
     }