Update rubocop-capybara to 2.23.0 and document --excluded_folders

[ydesgagn]

Summary

Bumps the rubocop-capybara gem to 2.23.0 (which broadens its rubocop dependency to ~> 1.81) and refreshes the architecture documentation to reflect that excluded folders for gitignore template detection now combine config-driven directories, submodules, and the --excluded_folders CLI option.

Key changes:

• Bump rubocop-capybara from 2.22.1 to 2.23.0 in Gemfile.lock (rubocop dep updated to ~> 1.81)
• Update docs/architecture.md to describe the combined source of excluded paths (config + submodules + --excluded_folders)

Types of changes

• Bugfix (fixes an issue)
• New feature (adds functionality)
• Refactoring (improves code without changing functionality)
• Breaking change (incompatible changes)
• Build or security update (updates dependencies, libraries, or security patches)
• Code style or documentation update (formatting, renaming, or documentation changes)
• Other (please describe):

Checklist

• Unit tests added to validate my fix/feature
• I have manually tested my change
• I did not add automation test. Why ?: Dependency bump and documentation-only change; existing test suite covers behavior.
• Database changes requiring migration with downtime or reprocessing of existing data
• The SOUP file lists the risk Level, requirements and verification reasoning associated with each library
• readme.md includes sections on introduction, installation, usage, and contributing
• docs/architecture.md includes sections on the architecture diagram, software units, software of unknown provenance, critical algorithms and risk controls related to PII and security
• Impact on PII, privacy regulations (CCPA/GDPR/PIPEDA), CIS benchmarks or security (availability/confidentiality/integrity); management must be notified