Model Gateway Provider Ops

The chapters in this module, in reading order.

#	Chapter
00	Model gateway and provider operations — First-principles overview
01	Why direct provider calls break
02	Gateway anatomy
03	Routing policies
04	Fallback chains
05	Rate limits and quotas
06	Keys and credentials
07	Cost attribution and budgets
08	Prompt and response caching
09	Provider drift and deprecation
10	Multi-region and privacy
11	Observability per provider
12	Architect checklist
13	Honest admission