fix(ci): override pyproject addopts so auditor tests don't need pytest-cov

The citation-audit workflow only installs ``pytest`` (no coverage
toolchain) because the auditor tests are stdlib-only. But pytest
auto-applies the project's ``pyproject.toml`` addopts, which include
``--cov=statspai`` — so the CI run died with
``ERROR: usage: ... unrecognized arguments --cov=statspai`` and
never reached the live auditor steps.

Override addopts with ``-o 'addopts='`` to run the tests in isolation.
Local ``pytest`` (with the full [dev] extras) keeps its coverage
reporting unchanged.

Verification: ran the exact CI invocation locally,
  python -m pytest tests/test_audit_citations.py \
    tests/test_audit_bib_duplicates.py -o 'addopts=' -q
  -> 49 passed in 0.99s

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: brycewang-stanford

.github/workflows/citation-audit.yml

@@ -72,7 +72,15 @@ jobs:
         # Fast (<1s) stdlib-only tests guarding DOI regex / Q-network
         # stopword / parse_bib brace-balance regressions. Runs BEFORE
         # the live auditors so a broken auditor can't silently pass.
-        run: python -m pytest tests/test_audit_citations.py tests/test_audit_bib_duplicates.py --no-cov -q
+        #
+        # -o 'addopts=' overrides the project-wide pyproject.toml addopts
+        # (which pull in --cov=statspai for local dev); the auditor tests
+        # are stdlib-only and don't need the full coverage toolchain.
+        run: |
+          python -m pytest \
+            tests/test_audit_citations.py \
+            tests/test_audit_bib_duplicates.py \
+            -o 'addopts=' -q
 
       - name: Run paper.bib duplicate auditor (strict)
         id: bib_audit