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## Summary - When `TsconfigDiscovery::Auto` walks parent directories and finds a `tsconfig.json` that exists but cannot be read (e.g. permission denied in sandboxed environments like Bazel/Docker), treat it as if no tsconfig exists at that level and continue walking parent directories. - Previously, `read_to_string` I/O failures were mapped to `TsconfigNotFound`, conflating "file not found" with "file not readable." Now I/O errors are properly mapped to `IOError`, and `find_tsconfig_auto` catches `IOError` to skip unreadable files while still propagating real config errors (bad JSON, broken extends, circular references). Context: https://github.com/vitejs/vite/pull/21705#issuecomment-3957052097 ## Test plan - Added `tsconfig_discovery_skips_unreadable_file` test (unix-only) that creates a `tsconfig.json` with `chmod 000` and verifies `find_tsconfig` returns `Ok(None)` - All existing tsconfig discovery tests continue to pass --------- Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com> Co-authored-by: Boshen <[email protected]> Co-authored-by: Hanzo Dev <[email protected]>