Add Sorbet sigils to every file in lib/

[rmosolgo]

Expands Sorbet coverage beyond lib/graphql.rb by giving every file in lib/ an explicit sigil.

What changed

• # typed: true on 182 files. Each of these already passed srb tc --typed=true with no code changes.
• # typed: false on the 150 files that still have errors at true (about 1,100 errors in total). These were already effectively false; the sigil just says so, so each one can be moved up later.
• # typed: ignore on the 44 files that sorbet/config already --ignores (generators, dashboard and the optional tracing integrations). sorbet/config is unchanged.
• Sorbet/HasSigil from rubocop-sorbet, enabled for lib/**/*.rb. rubocop-sorbet is added as a development dependency next to rubocop in the gemspec. The cop flags any file without a # typed: sigil and can autocorrect by inserting # typed: false.

Each sigil goes on line 2, right after # frozen_string_literal: true, matching lib/graphql.rb. The only change to lib/ is that added comment line.

Verification

• BUNDLE_GEMFILE=gemfiles/sorbet.gemfile bundle exec srb tc: no errors
• bundle exec rake rubocop: no offenses. This passes under both the default Gemfile and gemfiles/sorbet.gemfile, and I checked that the cop flags a file with no sigil.
• Spot-checked specs (backtrace, schema, execution errors, fields_will_merge) all pass. No spec asserts on line numbers inside lib/.

For reviewers

• lib/graphql/static_validation/rules/fields_will_merge.rb starts with # frozen_string_literal: true (note the leading space), so the magic comment isn't active in that file. I left it alone because fixing it would change runtime behavior.
• Suggested next steps: fix the false files that have 1–2 errors (57 of them). After that, tackle the common error patterns: modules that call methods from the class they're mixed into (context, add_error) and lazily initialized nilable ivars.

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