Two independent fixes salvaged from #12811 (closing it; one of its three
bundled fixes — Discord free_response — is already on main).
Anthropic max_tokens (#12790): the chat-completions max_tokens fallback only
fired for OpenRouter/Nous URLs, so any other proxy serving a Claude model
(AWS Bedrock, NVIDIA, LiteLLM, vLLM, corporate gateways) shipped requests
with no max_tokens and inherited the proxy's low default (Bedrock: 4096),
exhausting on thinking + large tool calls. Changed the gate in
chat_completion_helpers.build_api_kwargs from URL-gated to model-gated:
fires whenever the model matches an _ANTHROPIC_OUTPUT_LIMITS key. This also
fixes a latent miss — the old 'claude' substring gate skipped MiniMax and
Qwen3 even on OpenRouter. Remains a last-resort fallback (build_kwargs only
applies it after ephemeral/user/profile max_tokens), so it never overrides
an explicit value, and only touches the chat-completions transport (native
Anthropic Messages API is a separate path).
Feishu channel_prompt (#12805): the Feishu adapter never resolved
channel_prompts config, unlike Discord/Slack, so per-channel role prompts
were silently ignored. Added _resolve_channel_prompt() (delegating to the
shared gateway.platforms.base.resolve_channel_prompt) and wired it into all
three MessageEvent construction sites — inbound message, reaction routing,
and card-action routing.
Tests: tests/gateway/test_feishu_channel_prompts.py (6 cases) covering exact
match, parent-thread fallback, no-match, missing-config safety, and event
propagation.
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