[Step 4] Core: Test Suite Update for Base URL Normalization

[fderuiter]

Context

We must verify that the path constructor does not break safe characters or introduce double encoding.

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🗺️ Execution Plan

• Open tests/unit/test_base_url_normalization.py.
• Add a test for email parameters (e.g., user@domain.com inside a path).
• Add a test proving double slashes are dynamically stripped.

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✅ Definition of Done (Acceptance Criteria)

• test_build_safe_path_handles_special_characters is written and passing.
• test_build_safe_path_prevents_double_slashes is written and passing.
• pytest tests/unit/test_base_url_normalization.py runs with 100% success.