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This PR gives the `generate` function's "apply @Foo to Goal" trace nodes their own trace sub-class `Meta.synthInstance.apply` instead of sharing the parent `Meta.synthInstance` class. This allows metaprograms that walk synthesis traces to distinguish instance application attempts from other synthesis nodes by checking `td.cls` rather than string-matching on the header text. The new class is registered with `inherited := true`, so `set_option trace.Meta.synthInstance true` continues to show these nodes. Motivated by mathlib's `#defeq_abuse` diagnostic tactic (https://github.com/leanprover-community/mathlib4/pull/35750) which currently checks `headerStr.contains "apply"` to identify these nodes. See https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency 🤖 Prepared with Claude Code --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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