Create production-ready combined cache + retry solution

[ebembi-crdb]

• Add comprehensive netlify.toml with cache plugin and retry settings
• Include build-test.sh with combined testing mode support
• Add production-ready-test.md with realistic failure scenarios
• Configure package.json with netlify-plugin-cache dependency
• Ready for production deployment with 99% reliability target

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[github-actions[bot]]

Files changed:

• src/current/_config_base.yml
• src/current/_config_enable_remote_cache.yml
• src/current/netlify.toml
• src/current/netlify/build-test.sh
• src/current/package.json
• src/current/v25.3/production-ready-test.md

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