Fix renderer metadata value: use "citeproc-py" consistently

[Copilot]

Bot reviewer identified that render_bibliography_to_strings() returns "citeproc-py" but tests were checking for "citeproc". A prior commit incorrectly changed the implementation instead of the tests, breaking other tests expecting "citeproc-py".

Changes

• api.py: Reverted render_bibliography_to_strings() to return "citeproc-py" in metadata
• test_rendering.py: Updated assertions to check for "citeproc-py" in:
  • test_render_bibliography_multiple_citations (line 176)
  • test_render_bibliography_apa_style (line 107)

Using "citeproc-py" aligns with the actual package name and existing test expectations.

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