test(core): cover operator env path resolution

[seonghobae]

Scope

Add focused contract coverage for operator_env_file_paths, including default ordered paths, home expansion, custom paths, and the ~ boundary. Production behavior is unchanged.

This is the clean replacement for #1285's valid test slice; the original branch contained unrelated repository-wide deletions and is not merge-safe.

Verification

• PYTHONPATH=. python3 -m pytest -q backend/tests/test_env_paths.py
• ruff check backend/tests/test_env_paths.py
• git diff --check

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Reviewing files that changed from the base of the PR and between 81c1056 and e058f8c.

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• backend/tests/test_env_paths.py

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[seonghobae]

Current-head review completed for 10446594.

The added tests exercise both default and custom operator env-file path resolution under an isolated HOME, including the existing configured path contract. No production behavior change is included in this test-only PR.

Verification: python -m pytest backend/tests/test_env_paths.py -q → 5 passed; Ruff and git diff --check passed.