fix: use pathlib.Path for cross-platform path parsing on Windows

[andrey-savov]

Summary

• Replace recipe.split("/")[-2] with Path(recipe).parts[-2] in list_models() — fixes IndexError when running otx find on Windows where str(Path) uses backslashes
• Replace string split/join pattern in OTXEngine.from_model_name() with Path(default_config).parent / f"{model_name}.yaml" for the same reason

Fixes #4490.

Test plan

• uv run pytest library/tests/unit/backend/native/utils/test_api.py — 11 tests pass
• uv run pytest library/tests/unit/backend/native/test_engine.py — 15 tests pass
• Manual: otx find --task MULTI_CLASS_CLS on Windows no longer raises IndexError

[Copilot]

Pull request overview

This PR fixes Windows path-handling issues in the native backend by switching from manual string splitting/joining to pathlib.Path-based path parsing and construction, preventing IndexError in otx find and improving cross-platform correctness.

Changes:

• Update list_models() to derive the task directory via Path(recipe).parts instead of recipe.split("/").
• Update OTXEngine.from_model_name() to build the target config path via Path(default_config).parent / f"{model_name}.yaml" instead of split/join on /.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
library/src/otx/backend/native/engine.py	Builds model config paths using Path(...).parent / ... to avoid platform-specific separators.
library/src/otx/backend/native/cli/utils.py	Uses Path(recipe).parts to extract the task segment in a platform-independent way for CLI table output.

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[andrey-savov]

Tested end-to-end on Windows 11 with \ — now works fully. Also fixed a second Windows-only bug discovered during testing: \ when Rich tried to render the OTX logo through the legacy Windows console (cp1252 encoding can't handle the box-drawing characters). Fix: reconfigure stdout to UTF-8 at CLI entry and disable Rich's legacy Windows renderer ().

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
library/src/otx/backend/native/engine.py	40.00%	3 Missing ⚠️

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[andrey-savov]

Added a test case in est_from_config_with_model_name that passes an unsupported task to OTXEngine.from_model_name(), covering the previously missing ValueError branch. All 3 uncovered lines in �ngine.py now have coverage. Commit: 4f5581b.