codex: add structured PR review template

[haasonsaas]

Summary

• add a Codex structured PR review workflow template that uses a JSON schema and publishes inline review comments
• add the review schema, prompt, and Ruby publishing helper with unit coverage
• document higher-leverage Codex adoption patterns: structured outputs, evidence runs, repo skills, hooks, MCP, and app-server exploration

Validation

• ruby -Itest -e 'ARGV.each { |path| require "./#{path}" }' test/_test.rb\n- ruby -e 'require "yaml"; ARGV.each { |f| YAML.load_file(f); puts "ok #{f}" }' .github/workflow-templates/.yml .github/workflows/.yml\n- ruby -e 'require "json"; ARGV.each { |f| JSON.parse(File.read(f)); puts "ok #{f}" }' .github/workflow-templates/.properties.json .github/codex/schemas/*.json\n- actionlint .github/workflow-templates/codex-structured-pr-review.yml .github/workflows/codex-rails-check.yml\n- git diff --check

[cursor]

PR Summary

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