Write tests for all known types of error conditions

[jviotti]

Signed-off-by: Juan Cruz Viotti [email protected]

[augmentcode]

🤖 Augment PR Summary

Summary: This PR expands IR compilation test coverage by asserting that known invalid/unsupported schemas fail with the expected exception types.

Changes:

• Added test/ir/ir_test.cc with focused EXPECT_THROW cases for unsupported dialects, unsupported keywords, invalid keyword values, and unsupported schema shapes.
• Updated test/ir/CMakeLists.txt to build the new IR unit test source.

Technical Notes: The new tests validate the stability of error contracts across SchemaVocabularyError, UnsupportedKeywordError, UnsupportedKeywordValueError, and UnexpectedSchemaError.

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[augmentcode]

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