Stop retaining the unused original options hash

[OskarEichler]

Summary

Remove the unused @static reference in Uber::Options#initialize. Since 0.1.0, every entry is already wrapped and stored in the Options hash; nothing reads @static. Retaining the caller's entire original Hash is unnecessary and can keep subsequently removed entries alive.

Reproduction

require 'uber/options'
require 'weakref'
def sample
  input = {payload: Object.new}
  [Uber::Options.new(input), WeakRef.new(input)]
end
options, reference = sample
3.times { GC.start }
p !!reference.weakref_alive?
p options.evaluate(nil).keys

Original: true, [:payload]. Fixed: false, [:payload]. Required wrapped values remain reachable, while the original input Hash can be collected.

Verification

• Existing baseline and this isolated branch: bundle exec rake test, 45 tests / 50 assertions, zero failures/errors/skips on Ruby 4.0.6 / Minitest 4.7.5.
• 1,000 focused checks on Ruby 3.2.11 and 4.0.6: 250 frozen source hashes become collectable, evaluated values remain correct, repeated results remain independent, and Options Hash mutation works.
• Release-based combination with the separate keyword-forwarding fix passes the existing 45-test suite on both Rubies, 4,202 forwarding checks and 2,750 inheritance/delegation boundary checks. All eight runtime files compile; package retains 25 paths and unchanged compared metadata. Two existing Lint offenses unchanged.
• Downstream Representable 3.2.0 baseline/fixed each pass 544 tests / 700 assertions, zero failures/errors and three existing skips on Ruby 3.2.11. Ruby 4 has the same eight legacy inspection-format failures, zero errors and three skips. Existing tests/expectations are unchanged; external tooling supplies the legacy MiniTest alias and profiler API.

Compatibility / limitations

No documented API breaking change intended. The undocumented, unused @static instance variable no longer exists; reflective code relying on it would be affected. This deliberately does not deep-copy or change the wrapped values or result Hash behavior. The older #17 static-result aliasing proposal addresses a different, superseded implementation.

No new/modified checked-in tests. Ruby 1.9.3–3.1, JRuby, Windows and Linux were not run locally. Collection evidence is from CRuby WeakRef/GC checks; no production memory-size or throughput claim.