Add Hookable support to Repository and wrap delegated model calls with hooks

[bnlucas]

Motivation

• Repositories should support the same hook lifecycle API used by Operation and Flow via Gaskit::Core::Hookable so global/inline hooks can observe repository behavior.
• Delegated ActiveRecord-like calls need to be able to run before, around, and after hooks to support cross-cutting concerns like metrics and auditing.

Description

• Include Gaskit::Core::Hookable into Gaskit::Repository and require the hookable helper with require_relative "core/hookable".
• Wrap delegated model methods in delegate_common_model_methods with hook_runner.apply_hooks(:before, :around, :after) so hooks execute around the model.public_send call.
• Add a class-level hook_runner helper that allocates a repository instance for running hooks and expose instance helpers logger and model for use inside hooks.
• Add a spec it "runs hooks around delegated calls" to spec/gaskit/repository_spec.rb that verifies around hooks run surrounding delegated calls.

Testing

• Added the new spec case in spec/gaskit/repository_spec.rb covering around hooks on delegated methods.
• Attempted to run the tests with bundle exec rspec spec/gaskit/repository_spec.rb but the environment reported bundler: command not found: rspec, so automated test execution could not be completed.

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Codex Task