Fix mixed PGN comment annotations

[NSStudent]

Summary

• parse adjacent PGN square and arrow annotations with trailing text in the same comment block
• keep pure text comments on the existing parser path
• add direct CommentListParser coverage and a PGNGameParser integration case

Tests

• rtk swift test --filter CommentListParserTests
• rtk swift test --filter PGNGameParserTests/calAndCslSameComment
• rtk swift test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
...Parsers/CommentParsers/MultipleCommentParser.swift	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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