Rake task helpers and constants pollute the global namespace in host apps

[kanejamison]

Problem

setup.rake, add.rake, install.rake, and sample_data.rake define helper methods (add_route, generate_views, generate_controller, root_route_exists?, ...) with bare def inside namespace blocks — these land on Object in every host app that bundles the gem. Same for include Bunko::RakeHelpers and the top-level BUNKO_STANDARD_PAGES constant (sample_data.rake:7). Generic names like add_route invite collisions with host-app rake code or other gems.

Proposed solution

Move all helpers into Bunko::RakeHelpers (or per-task modules under it) as module_functions and call them fully qualified (Bunko::RakeHelpers.render_template(...)). Move BUNKO_STANDARD_PAGES into that module.

Acceptance criteria

• No methods or constants defined at the top level by any shipped rake file.
• test/tasks/ suite passes.