- docs/concepts/model-providers.md: add proxy-route shaping rule for the
09ec5d2c4d fix that suppresses implicit Anthropic beta headers
(`claude-code-20250219`, `interleaved-thinking-2025-05-14`, OAuth markers)
on non-direct endpoints, parallel to the existing OpenAI
`compat.supportsDeveloperRole` rule.
- docs/gateway/cli-backends.md: add a "Fallback prelude from claude-cli
sessions" section for a96f1fa5ef so users know that non-CLI fallback
candidates after a claude-cli failure are now seeded with a context prelude
harvested from Claude Code's `~/.claude/projects/` JSONL (preferring the
latest `/compact` summary, coalescing tool blocks, skipping same-provider
`--resume` fallbacks).