feat: add trace.Meta.Tactic.simp.backwardDefEq#13640
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Trace event emitted whenever a `dsimp` (or rfl-only `simp`) rewrite fires because of a `[backward_defeq]`-tagged theorem (i.e., one that would not have applied without `set_option backward.defeqAttrib.useBackward true`). Useful for finding where downstream code is silently relying on the backwards escape hatch — a precursor to either re-tagging the lemma as `[defeq]` or restructuring the proof so it works under the strict defeq rules.
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This PR adds a trace event emitted whenever a
dsimp(or rfl-onlysimp) rewrite firesbecause of a
[backward_defeq]-tagged theorem (i.e., one that would nothave applied without
set_option backward.defeqAttrib.useBackward true).Useful for finding where downstream code is silently relying on the
backwards escape hatch — a precursor to either re-tagging the lemma as
[defeq]or restructuring the proof so it works under the strictdefeq rules.