fix: migrate to Policyfile

[damacus]

Summary

• replace Berkshelf dependency resolution with Policyfile
• use explicit GitHub cookbook sources for minitest-handler, chef_handler, and windows
• switch Kitchen to Policyfile named run list and dummy verifier for Windows exec
• update sous-chefs workflow/action pins to 8.0.4

Validation

• chef update Policyfile.rb
• chef install Policyfile.rb
• cookstyle
• embedded RSpec: 2 examples, 0 failures
• markdownlint-cli2 .
• yamllint .
• actionlint
• git diff --check
• KITCHEN_LOCAL_YAML=kitchen.exec.yml kitchen list
• KITCHEN_LOCAL_YAML=kitchen.exec.yml kitchen diagnose default-windows-latest --loader --no-instances

Focused Kitchen converge is Windows-runner only for this cookbook; local validation confirms Kitchen resolves PolicyfileZero with Dummy verifier for the windows-latest exec instance.

[github-actions]

Slowest examples

Top 2 slowest examples (0.26 seconds, 100% of total time)

Example	Description	Time in seconds
spec/default_spec.rb:10	notepadpp::default 32-bit Windows downloads the Notepad++ package	0.16609
spec/default_spec.rb:25	notepadpp::default 64-bit Windows downloads the Notepad++ package	0.10328