Use AbsolutePathBuf in skill loading and codex_home (#17407)

Helps with FS migration later

codex-rs/core/src/skills.rs

@@ -1,8 +1,6 @@
 use std::collections::HashMap;
 use std::collections::HashSet;
 use std::env;
-use std::path::Path;
-use std::path::PathBuf;
 use std::sync::Arc;
 
 use crate::codex::Session;
@@ -15,6 +13,7 @@ use codex_protocol::protocol::SkillScope;
 use codex_protocol::request_user_input::RequestUserInputArgs;
 use codex_protocol::request_user_input::RequestUserInputQuestion;
 use codex_protocol::request_user_input::RequestUserInputResponse;
+use codex_utils_absolute_path::AbsolutePathBuf;
 use tracing::warn;
 
 pub use codex_core_skills::SkillDependencyInfo;
@@ -43,10 +42,10 @@ pub use codex_core_skills::system;
 
 pub(crate) fn skills_load_input_from_config(
     config: &Config,
-    effective_skill_roots: Vec<PathBuf>,
+    effective_skill_roots: Vec<AbsolutePathBuf>,
 ) -> SkillsLoadInput {
     SkillsLoadInput::new(
-        config.cwd.clone().to_path_buf(),
+        config.cwd.clone(),
         effective_skill_roots,
         config.config_layer_stack.clone(),
         config.bundled_skills_enabled(),
@@ -172,7 +171,7 @@ pub(crate) async fn maybe_emit_implicit_skill_invocation(
     sess: &Session,
     turn_context: &TurnContext,
     command: &str,
-    workdir: &Path,
+    workdir: &AbsolutePathBuf,
 ) {
     let Some(candidate) = detect_implicit_skill_invocation_for_command(
         turn_context.turn_skills.outcome.as_ref(),
@@ -184,7 +183,7 @@ pub(crate) async fn maybe_emit_implicit_skill_invocation(
     let invocation = SkillInvocation {
         skill_name: candidate.name,
         skill_scope: candidate.scope,
-        skill_path: candidate.path_to_skills_md,
+        skill_path: candidate.path_to_skills_md.to_path_buf(),
         invocation_type: InvocationType::Implicit,
     };
     let skill_scope = match invocation.skill_scope {