- MODEL_CAPACITY_EXHAUSTED now uses independent retry strategy:
- retryDelay < 20s: wait actual retryDelay then retry once
- retryDelay >= 20s or missing: retry up to 5 times at 20s intervals
- Still capacity exhausted after retries: switch account (failover)
- Different error during retry (e.g. 429): handle by actual error code
- No model rate limit set (capacity != rate limit)
- Remove Antigravity extra failover retries feature:
Same-account retry mechanism (cherry-picked) makes it redundant.
Removed: antigravityExtraRetries config, sleepFixedDelay, skip-non-antigravity logic.
Remove threshold-based waiting in both sticky session and antigravity
pre-check paths. When a model is rate-limited, immediately clear the
sticky session and switch accounts instead of waiting for short durations.
- GetAccessToken: add upstream branch to read api_key from credentials
- shouldTriggerAntigravitySmartRetry: relax check from IsOAuth to Platform-based
- isModelSupportedByAccount/WithContext: replace IsAntigravityModelSupported
whitelist with mapAntigravityModel for unified scheduling/forwarding logic
- mapAntigravityModel: fix edge case where wildcard target equals request model
- Update tests for new behavior and add custom model_mapping test cases
