fix(tests): mock system config path and skip pandoc tests when unavailable

Koushik Kumaranrequested to merge
370-fix-local-test-failures into main

Closes #370 (closed)

Allows tests to be run locally. Tested with uv run pytest

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

Edited by Koushik Kumaran

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