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cj/--latex-select-pdf-viewer runs on every LaTeX-mode buffer and was blindly pushing an (output-pdf VIEWER) entry onto TeX-view-program-selection, so each LaTeX buffer opened in a session stacked another duplicate. The head still won, so the viewer worked, but the list grew and the docstring's idempotency claim was false. I drop any existing output-pdf entry before consing the chosen viewer, which also makes "wins over any default" actually true.
Added a test file (the module had none) covering selection, preference order, the PDF-Tools fallback, idempotency, and default override, with executable-find mocked so the run doesn't depend on which viewers are installed.
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