fix: migrate to Policyfile

[damacus]

Summary

• migrate cookbook dependency resolution from Berksfile to Policyfile.rb
• switch ChefSpec to chefspec/policyfile and preserve Kitchen suite run lists with named_run_list
• replace LIMITATIONS.md with AGENTS.md and update Copilot setup to run chef install Policyfile.rb
• set the Dokken Cinc chef_binary so the Policyfile integration lane converges with the Cinc container

Validation

• chef install Policyfile.rb
• git diff --check
• cookstyle
• env GEM_HOME=/opt/chef-workstation/embedded/lib/ruby/gems/3.1.0 GEM_PATH=/opt/chef-workstation/embedded/lib/ruby/gems/3.1.0 /opt/chef-workstation/embedded/bin/rspec --format documentation
• env KITCHEN_LOCAL_YAML=kitchen.dokken.yml kitchen list
• env KITCHEN_LOCAL_YAML=kitchen.dokken.yml kitchen test default-ubuntu-2404 --destroy=always
• actionlint
• yamllint .
• markdownlint-cli2 "**/*.md"

[github-actions]

Slowest examples

Top 10 slowest examples (0.54 seconds, 99.46% of total time)

Example	Description	Time in seconds
spec/default_spec.rb:17	postfix resource on AlmaLinux 9 renders file main.cf with /etc/pki/tls/cert.pem	0.09395
spec/default_spec.rb:31	postfix resource on Ubuntu 24.04 renders file main.cf with /etc/ssl/certs/ca-certificates.crt	0.06457
spec/wrapper_spec.rb:14	test::default legacy wrapper attributes keeps wrapper cookbook defaults when rendering main.cf	0.06387
spec/resource_spec.rb:71	postfix resources postfix_server renders server mode	0.06342
spec/resource_spec.rb:37	postfix resources postfix_config with aliases renders aliases through postfix_map	0.05401
spec/resource_spec.rb:57	postfix resources postfix_config with access maps renders the access map file	0.05266
spec/resource_spec.rb:47	postfix resources postfix_map renders a map file	0.04855
spec/resource_spec.rb:25	postfix resources postfix_install with exim4 present stops and purges exim4 so postfix can bind port 25	0.03726
spec/sasl_auth_spec.rb:11	postfix_sasl_auth resource password file template does not display sensitive information	0.03255
spec/resource_spec.rb:13	postfix resources postfix_install installs postfix	0.0295