- Restructured documentation from user-facing guides to technical implementation references across 18 files in packages/coding-agent/docs.
- Reorganized compaction.md, config-usage.md, custom-tools.md, and extensions.md to emphasize architecture and integration patterns over step-by-step tutorials.
- Expanded environment-variables.md, extension-loading.md, fs-scan-cache-architecture.md, and python-repl.md with detailed runtime behavior and implementation details.
- Consolidated hooks.md, rpc.md, sdk.md, and theme.md from comprehensive reference documentation to focused technical specifications.
- Refined session.md, session-tree-plan.md, skills.md, tree.md, and tui.md to clarify runtime behavior, discovery mechanisms, and technical contracts.
- Added comprehensive `models.yml` provider integration guide documenting custom model registration, provider overrides, API adapters, merge behavior, and practical integration patterns for Ollama, vLLM, LM Studio, and proxy endpoints.
- Updated README to reference new `models.yml` documentation and clarified that `models.json` is still supported for legacy configurations.
- Updated CHANGELOG to document the new models.yml guide and configuration format migration.
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