docs: Document provider addition process and npm package architecture#2

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copilot/review-models-provider-process

Commits on Feb 3, 2026

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docs: Add comprehensive guide for adding providers and models

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docs: Add step-by-step guide and quick start section

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docs: Add summary of provider addition process

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fix: Correct documentation to use real anomalyco/opencode examples

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fix: Remove hard-coded line numbers for maintainability

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docs: Add real PR example (SAP AI Core #5023) - provider NOT on models.dev

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docs: Explain how npm packages provide API URLs (not OpenCode)

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