Drop redundant require "spec_helper" from spec files

[yahonda]

Summary

The project-level .rspec introduced in #294 contains --require spec_helper, which makes RSpec auto-load spec/spec_helper.rb before any example file. The explicit require "spec_helper" at the top of each spec/plsql/*.rb is therefore redundant.

Remove the require line plus the immediately-following blank line from all 11 files under spec/plsql/:

• connection_spec.rb
• package_spec.rb
• procedure_spec.rb
• schema_spec.rb
• sequence_spec.rb
• sql_statements_spec.rb
• table_spec.rb
• type_spec.rb
• variable_spec.rb
• version_spec.rb
• view_spec.rb

The # encoding: utf-8 magic comment that appears at the top of three files (connection_spec.rb, procedure_spec.rb, variable_spec.rb) is intentionally left alone — out of scope here.

Diff stat: 11 files changed, 22 deletions(-).

Test plan

• bundle exec rspec — 468 examples, 0 failures, 1 pre-existing pending (the Oracle 9.2 indexed-by-binary-integer skip). Confirms --require spec_helper from .rspec continues to load the helper before each example file.
• Grep confirms zero remaining require "spec_helper" lines under spec/plsql/
• CI matrix exercises all Ruby / AR / driver combinations

🤖 Generated with Claude Code