test: QA Boundary Value Analysis for SchemaValidator

[theRebelliousNerd]

test: QA Boundary Value Analysis for SchemaValidator

Adds a comprehensive >400 line QA journal entry documenting edge cases,
performance limits, and concurrency risks in the Mangle SchemaValidator.
Injects corresponding TODO comments into schema_validator_test.go to
track future implementation of these tests.

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PR created automatically by Jules for task 17120895400305213673 started by @theRebelliousNerd

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