path-uri: clarify host-native path conversion (#29501)

## Why

Downstream refactors are producing confusing code with this
functionality having a very generic name. Encoding the specific
conversion approach in the method name makes it clearer.

## What

Rename `PathUri::from_path` to `PathUri::from_host_native_path` and
update its Rust call sites.

codex-rs/core/src/apply_patch_tests.rs

@@ -8,7 +8,7 @@ use tempfile::tempdir;
 fn convert_apply_patch_maps_add_variant() {
     let tmp = tempdir().expect("tmp");
     let path = tmp.path().join("a.txt");
-    let path_uri = PathUri::from_path(&path).expect("absolute test path");
+    let path_uri = PathUri::from_host_native_path(&path).expect("absolute test path");
     let action = ApplyPatchAction::new_add_for_test(&path_uri, "hello".to_string());
 
     let got = convert_apply_patch_to_protocol(&action);

codex-rs/core/src/tools/events.rs

@@ -645,7 +645,7 @@ mod tests {
             make_session_and_context_with_dynamic_tools_and_rx(Vec::new()).await;
         let tracker = Arc::new(Mutex::new(TurnDiffTracker::new()));
         let dir = tempdir().expect("tempdir");
-        let cwd = PathUri::from_path(dir.path()).expect("absolute cwd");
+        let cwd = PathUri::from_host_native_path(dir.path()).expect("absolute cwd");
         let mut stdout = Vec::new();
         let mut stderr = Vec::new();
         let delta = codex_apply_patch::apply_patch(
@@ -729,7 +729,7 @@ mod tests {
             make_session_and_context_with_dynamic_tools_and_rx(Vec::new()).await;
         let tracker = Arc::new(Mutex::new(TurnDiffTracker::new()));
         let dir = tempdir().expect("tempdir");
-        let cwd = PathUri::from_path(dir.path()).expect("absolute cwd");
+        let cwd = PathUri::from_host_native_path(dir.path()).expect("absolute cwd");
 
         for patch in [
             "*** Begin Patch\n*** Add File: a.txt\n+one\n*** End Patch",
@@ -782,7 +782,7 @@ mod tests {
             make_session_and_context_with_dynamic_tools_and_rx(Vec::new()).await;
         let tracker = Arc::new(Mutex::new(TurnDiffTracker::new()));
         let dir = tempdir().expect("tempdir");
-        let cwd = PathUri::from_path(dir.path()).expect("absolute cwd");
+        let cwd = PathUri::from_host_native_path(dir.path()).expect("absolute cwd");
         let mut stdout = Vec::new();
         let mut stderr = Vec::new();
         let delta = codex_apply_patch::apply_patch(

codex-rs/core/src/turn_diff_tracker_tests.rs

@@ -18,7 +18,7 @@ fn git_blob_sha1_hex(data: &str) -> String {
 }
 
 async fn apply_verified_patch(root: &Path, patch: &str) -> AppliedPatchDelta {
-    let cwd = PathUri::from_path(root).expect("absolute tempdir path");
+    let cwd = PathUri::from_host_native_path(root).expect("absolute tempdir path");
     let argv = vec!["apply_patch".to_string(), patch.to_string()];
     match codex_apply_patch::maybe_parse_apply_patch_verified(
         &argv,