fix: make validation errors recoverable by LLM

[YousefED]

This makes sure when validation errors occur (and specifically if an LLM omits the type of an operation), this error will bubble up to the error handler correctly. This gives the LLM the right info to "retry" the operation and recover the error when the user requests this

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Project	Deployment	Preview	Updated (UTC)
blocknote	Ready	Preview	Dec 5, 2025 9:30pm
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commit: b875a4f

[YousefED]

Most of this already landed in an earlier refactor, but still nice to remove the deprecated function + tests and improved error formatting