fix some logics & docs

[jsoizo]

Summary

• Tighten v2 parsing semantics: throw CsvParseFormatException on EOF inside an unterminated quoted field, and reject LF / CR / U+2028 / U+2029 / U+0085 as CsvDialect delimiter / quote / escape characters.
• Document v2 spec edges: clarify WriteQuoteMode.NON_NUMERIC as a digits-plus-at-most-one-dot lexical rule, and pin CsvFieldNumDifferentException.rowNum as a CSV row number (post skipEmptyLine filter) in README / Module.md / migration guide / KDoc.

Test plan

• ./gradlew check (commonTest + JVM / JS / native targets)
• Confirm Module.md file-API snippets compile against current public API
• Confirm CsvDialect rejects LF / CR / U+2028 / U+2029 / U+0085 in delimiter / quoteChar / escapeChar
• Confirm unterminated quoted field at EOF surfaces CsvParseFormatException on both String and chunked I/O paths

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.37%. Comparing base (15aba08) to head (9aba37b).
⚠️ Report is 7 commits behind head on version_2_0_0.

Files with missing lines	Patch %	Lines
...mmonMain/kotlin/com/jsoizo/kotlincsv/CsvDialect.kt	64.28%	3 Missing and 2 partials ⚠️
...jsoizo/kotlincsv/reader/internal/SequenceParser.kt	42.85%	0 Missing and 4 partials ⚠️
...soizo/kotlincsv/writer/internal/SequenceEncoder.kt	83.33%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           version_2_0_0     #179      +/-   ##
=================================================
- Coverage          94.87%   93.37%   -1.51%     
=================================================
  Files                 22       22              
  Lines                507      528      +21     
  Branches             116      122       +6     
=================================================
+ Hits                 481      493      +12     
- Misses                13       17       +4     
- Partials              13       18       +5     

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