feat: add usage tracking with live throughput rates and analytics dashboard

fix: route numbered OpenAI-compatible instance model refs

Add ChatGPT OAuth as an OpenAI Codex provider (#1279)

Preserve gateway model identity in Anthropic responses (#1270)

Make reasoning policy provider-neutral and client-aware (#1148)

Add searchable model selection to the Admin UI (#1121)

Add Fable as a first-class Claude routing tier (#1099)

Remove the native Anthropic provider transport (#1067)

Make response stream lifetimes explicit (#1060)

Make provider capabilities semantic and typed (#1047)

Canonicalize provider failure and retry ownership (#1046)

Introduce a typed application boundary for provider execution (#1045)