Cloudflare Workers AI free tier (10k Neurons/day, account-wide) returns
429 with body 'you have used up your daily free allocation of 10,000
neurons' which matched no QUOTA_PATTERNS keyword — falling through to
rate_limit (~60s cooldown) instead of quota_exhausted.
Two layers:
1. Provider-specific rule for 'cloudflare-ai' in providerRuleRegistry
(scope: connection — budget is account-wide, not per-model)
2. Defense-in-depth: /daily free allocation/i in classify429 QUOTA_PATTERNS
Tests: 11/11 pass (provider rule + classify429 paths covered).
Closes#6980
Co-authored-by: Diego Rodrigues de Sa e Souza <8016841+diegosouzapw@users.noreply.github.com>
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