Improve GlycoCT parser coverage

[fubin1999]

Summary

Improve parse_glycoct() coverage for GlycoCT records from the sequence corpus.

Details

• Accept space-separated GlycoCT records, including CSV-export style records where RES, residues, LIN, and linkages are stored on one line.
• Map representable generic GlycoCT descriptors to glyrepr monosaccharides, including generic HEX, N-acetylated HEX, deoxy-HEX, and generic Neu5Ac/Neu5Gc descriptors.
• Map direct GlycoCT n-sulfate substituents to N-sulfated amino sugars.
• Add focused regression coverage for the newly supported parser cases.
• Update NEWS.md with the live (#24) suffix for the GlycoCT entries.

Verification

• git rebase main
• Rscript -e 'devtools::document()'
• Rscript -e 'devtools::load_all(quiet = TRUE); devtools::test(filter = "parse-glycoct")' -> 306 passed
• Rscript -e 'devtools::test()' -> 943 passed
• air format R/parse-glycoct.R tests/testthat/test-parse-glycoct.R
• git diff --check main..HEAD

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[Copilot]

Pull request overview

This PR expands parse_glycoct() to handle additional real-world GlycoCT encodings found in the sequence corpus, improving successful parsing and adding regression coverage for the new cases.

Changes:

• Added preprocessing to accept space-separated / single-line GlycoCT records (e.g., CSV-export style).
• Added mapping for representable generic GlycoCT descriptors (generic HEX, N-acetylated HEX, deoxy-HEX, and generic Neu5Ac/Neu5Gc backbones).
• Added mapping of direct GlycoCT n-sulfate substituents to N-sulfated amino sugars, plus focused tests.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/testthat/test-parse-glycoct.R	Adds targeted regression tests for space-separated records and newly supported generic/N-sulfate mappings.
R/parse-glycoct.R	Implements line splitting for single-line records and adds generic composite matching + helper predicates/mappers.
NEWS.md	Documents the newly supported GlycoCT parsing/mapping behaviors.

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[fubin1999]

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[chatgpt-codex-connector]

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