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grind-eta-struct-for-eq
This PR fixes the grind_lint test files to use `#grind_lint skip` entries (in LintExceptions.lean and locally) instead of pinning exact `#guard_msgs` output for changed theorem counts. Also refactors `doEtaExpandStruct` to accept pre-matched structure info as parameters, avoiding redundant `matchConstNonRecStructure` calls, and reuses `αWhnf` from the Eq type in `propagateEtaStructForEq`. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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