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Update rubocop to 1.92.2 and tighten Metrics and line length limits (#3048)

.rubocop_todo.yml is regenerated against 1.92.2; only its offense counts
move. api_spec.rb drops an assignment that 1.92.2 now reports as
Lint/UselessAssignment.

The limits come down to what the code already meets, so they stop growth
without requiring a refactor. Metrics/MethodLength goes from 32 to 17 and
counts multi-line literals and calls as one line, so spreading a call
over several lines is not penalised. Metrics/ClassLength goes from 430 to
365 and Layout/LineLength from 215 to 213.

The Metrics/BlockLength override is removed: RuboCop's default of 25 now
holds, and rubocop-rspec already excludes specs. respond_to_missing? is
removed from Style/OptionalBooleanParameter's AllowedMethods, since no
method in lib or spec needs it.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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