docs: fallback chain overhaul, two-key strategy, operational model update (Aug 6 2026)
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# itpp-infrastructure — CHANGELOG
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## 2026-08-06 — Fallback Chain Overhaul & Two-Key Strategy
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- **Root cause:** Aug 5 admin-ai budget cap + 4 dead fallback legs = $45 Anthropic burn in 10 hours
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- Rotated all 5 fallback provider keys (new keys for deepseek, google, xai, anthropic, openai)
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- Added F5: gpt-4.1-nano via OpenAI direct (independent infrastructure)
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- Fixed F3: grok-4.6 → grok-4.5 (grok-4.6 never existed — LiteLLM catalog ghost)
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- Documented two-key strategy: operational keys (admin-ai only) vs fallback keys (direct, daily-capped)
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- Added to operational chain: claude-haiku-4-5 (lightweight), grok-4.5 (auditor 2), deepseek-v4-flash (batch)
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- Synced Anita profile with identical fallback chain + provider keys
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- Admin-ai budget raised: $20 → $30/day
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- Updated: model-chain.md, operational-models.md
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## 2026-07-16 — Audit Remediation
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- Created CHANGELOG.md (missing per project documentation standard)
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