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* fix(oauth): inject billing header for non-Haiku model access The Anthropic Messages API requires a billing identification block in the system prompt when using Claude Code OAuth tokens (sk-ant-oat*) to access non-Haiku models (Opus, Sonnet). Without it, the API returns a generic 400 "Error" with no actionable detail. This was discovered by intercepting Claude Code CLI requests — the CLI injects an `x-anthropic-billing-header` text block as the first system prompt entry on every request. Third-party consumers of the same OAuth tokens must do the same. Changes: - Add `_apply_oauth_billing()` to `ClaudeChatModel` that prepends the billing header block to the system prompt when `_is_oauth` is True - Add `metadata.user_id` with device/session identifiers (required by the API alongside the billing header) - Called from `_get_request_payload()` before prompt caching runs Verified with Claude Max OAuth tokens against all three model tiers: - claude-opus-4-6: 200 OK - claude-sonnet-4-6: 200 OK - claude-haiku-4-5-20251001: 200 OK (was already working) Closes #1245 * fix(oauth): address review feedback on billing header injection - Make OAUTH_BILLING_HEADER configurable via ANTHROPIC_BILLING_HEADER env var - Normalize billing block to always be first in system list (strip + reinsert) - Guard metadata with isinstance check for non-dict values - Replace os.uname() with socket.gethostname() for Windows compat - Fix docstrings to say "all OAuth requests" instead of "non-Haiku" - Move inline imports to module level (fixes ruff I001) - Add 9 unit tests for _apply_oauth_billing Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>