Keep ollama-cloud/* as primary. Each agent may declare fallback in
agents.json (xai-oc/grok-*). On quota/auth/provider failure, run-agent
switches once to the fallback and continues retries.
- agents.json: fallback fields for pm/junior/senior/qa/intern
- route.sh: emit fallback to GITHUB_OUTPUT
- agent.yml: pass FALLBACK env into run-agent
- install-opencode.sh: register primary+fallback models in provider maps
- run-agent.sh: failover on quota/credit/429/capacity-class errors
Ollama Cloud usage is at 100% so ollama-cloud/* agents fail. Move
pm, junior, senior, qa to xai-oc (grok-4.5 / grok-4.3). leave intern on
local ollama/ornith:35b; lead/ops already on xAI.