swev-id: astropy__astropy-14365 accept lowercase QDP commands

[casey-brooks]

Summary

• make QDP command detection case-insensitive and reject unknown directives
• strip inline comments before parsing READ SERR/TERR arguments
• document the behavior and add regression tests for command variations

Observed Failure

• Steps to reproduce:

  cat > test.qdp <<'QDP'
  read serr 1 2
  1 0.5 1 0.5
  QDP
  python - <<'PY'
  from astropy.table import Table
  Table.read('test.qdp', format='ascii.qdp')
  PY
  

• Stack trace excerpt:

  ValueError: Unrecognized QDP line: read serr 1 2
  

Testing

• LD_LIBRARY_PATH=/nix/store/wffgswxkp55xi14jy63rjsnfvl2qvmxy-gcc-14.3.0-lib/lib:/nix/store/qipd93x9gjyiygqk673rd2ssnf8y7jj0-gcc-14.3.0-lib/lib:/nix/store/zmjqwzhgl9hwr8xnk8raj8d50lzkql66-gcc-14.3.0-lib/lib:/nix/store/n5lymg0y5x6i9wipkjrsi8aczv1nr4qc-zlib-1.3.1/lib SETUPTOOLS_USE_DISTUTILS=stdlib PYTHONPATH=. .venv/bin/pytest astropy/io/ascii/tests/test_qdp.py -k qdp
• SETUPTOOLS_USE_DISTUTILS=stdlib .venv/bin/flake8 astropy/io/ascii/qdp.py astropy/io/ascii/tests/test_qdp.py --per-file-ignores='astropy/units/tests/test_units.py:F841,E501,E222,E711'

Resolves #119.

[casey-brooks]

Local validation

• LD_LIBRARY_PATH=/nix/store/wffgswxkp55xi14jy63rjsnfvl2qvmxy-gcc-14.3.0-lib/lib:/nix/store/qipd93x9gjyiygqk673rd2ssnf8y7jj0-gcc-14.3.0-lib/lib:/nix/store/zmjqwzhgl9hwr8xnk8raj8d50lzkql66-gcc-14.3.0-lib/lib:/nix/store/n5lymg0y5x6i9wipkjrsi8aczv1nr4qc-zlib-1.3.1/lib SETUPTOOLS_USE_DISTUTILS=stdlib PYTHONPATH=. .venv/bin/pytest astropy/io/ascii/tests/test_qdp.py -k qdp (14 passed)
• SETUPTOOLS_USE_DISTUTILS=stdlib .venv/bin/flake8 astropy/io/ascii/qdp.py astropy/io/ascii/tests/test_qdp.py --per-file-ignores='astropy/units/tests/test_units.py:F841,E501,E222,E711' (no issues)

[noa-lucent]

Looks good. Case-insensitive command detection, inline comment trimming, and regression coverage all check out.