fix(cli): correct input normalization regressions

[Seddryck]

Summary

• count parsed --batch identifiers instead of matching raw tokens
• reject duplicate IDataReader column names before record construction
• consume configured multi-row and repeated CSV headers without emitting them as data
• reject UTF-16 and UTF-32 BOMs while preserving UTF-8 BOM support

Validation

• Added regression tests before each fix and observed them fail, then pass unchanged after the implementation
• dotnet build Expressif.sln --nologo --no-restore
• dotnet test Expressif.sln --nologo --no-build --no-restore
• dotnet format Expressif.sln analyzers --verify-no-changes --no-restore
• pre-push StyleCop hook

Close #651
Close #652
Close #653
Close #654

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 97.77778% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.72%. Comparing base (2e0e6ab) to head (9229f17).
⚠️ Report is 1 commits behind head on next-major.

Files with missing lines	Patch %	Lines
...pressif.Cli/Infrastructure/SourceInfrastructure.cs	95.65%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           next-major     #655      +/-   ##
==============================================
+ Coverage       84.65%   84.72%   +0.06%     
==============================================
  Files             218      218              
  Lines            5970     6008      +38     
  Branches         1049     1060      +11     
==============================================
+ Hits             5054     5090      +36     
- Misses            600      602       +2     
  Partials          316      316              

Flag	Coverage Δ
expressif-cli-net10.0	39.84% <97.77%> (+0.38%)	⬆️
expressif-net10.0	81.68% <ø> (ø)
expressif-net8.0	81.68% <ø> (ø)
expressif-net9.0	81.68% <ø> (ø)

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