Support Fast Mode Claude Provider

[birdup000]

New Flag Enables Fast mode add to support fast mode

curl https://api.anthropic.com/v1/messages \
    --header "x-api-key: $ANTHROPIC_API_KEY" \
    --header "anthropic-version: 2023-06-01" \
    --header "anthropic-beta: fast-mode-2026-02-01" \
    --header "content-type: application/json" \
    --data '{
        "model": "claude-opus-4-6",
        "max_tokens": 4096,
        "speed": "fast",
        "messages": [{
            "role": "user",
            "content": "Refactor this module to use dependency injection"
        }]
    }'

[birdup000]

This allows your agents to level up in speed for this provider!