fix: record field names incorrectly emitted by genType

[illusionalsagacity]

I managed to find the source of this with Claude's help, though I don't have enough experience with ocaml to know for sure if this is an idiomatic fix.

resolves #8086

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commit: c4bdcd4

[cristianoc]

Is it possible to avoid quoting in the first place instead of un-quoting later?

[cknitt]

@cristianoc Codex says:

Avoiding the un-quoting here would mean normalizing escaped identifiers earlier (likely when the parser/typedtree builds Ident.t for escaped names). That’s a broader change and could affect other compiler stages that might be relying on the escaped form. The current fix is a localized workaround in genType that keeps the normalization close to the emission logic.