Add detailed diagnostics to SIARD XML validation errors#756

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Copilot wants to merge 7 commits intodevelopmentfrom

copilot/improve-validation-diagnostics

Commits on Feb 5, 2026

Initial plan
Copilot
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Add custom ErrorHandler and enhanced validation diagnostics for SIARD XML validation

Copilot
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hmiguim
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Fix regex pattern and add Locator for line tracking in SiardValidationErrorFormatter

Copilot
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hmiguim
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Add logging for context extraction failures and fix regex pattern

Copilot
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hmiguim
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Fix regex pattern, add debug logging, and limit reported errors to 5

Copilot
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hmiguim
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Extract MAX_REPORTED_ERRORS constant and improve SAX exception message

Copilot
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hmiguim
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Update comments to reference MAX_REPORTED_ERRORS constant and clarify SAX exception pattern

Copilot
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hmiguim
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