experiment: always check types for instance metavariables at instance transparency#13831
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This PR adds two opt-in trace augmentations for debugging definitional equality. Setting `trace.Meta.isDefEq.printTransparency` prefixes each `Meta.isDefEq` `=?=` trace node with the current transparency level (e.g. `[default]`, `[instances]`, `[implicit]`). Enabling the new `Meta.isDefEq.transparency` trace class additionally logs the reason whenever `withInstanceConfig` or `withImplicitConfig` raises the transparency to check an instance-implicit or implicit-value argument. Implementation: adds a `ToString TransparencyMode` instance, registers the option and trace class, and instruments the two wrappers in `ExprDefEq.lean`. Both features are off by default and incur no cost when disabled. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Claude-generated, just for testing, do not merge.