Adds ai.models tRPC router with provider CRUD, role routes, testProvider, and
resolveForRole; Vercel AI SDK client factory in packages/ai; Settings pages
for providers and role routing; agent_runs model metadata columns with MCP
complete_task fields and runs UI column.
Co-authored-by: Cursor <cursoragent@cursor.com>
Read-side only — write paths land with claim_task / complete_task
in the next epic. Keyset pagination on started_at, three procedures
(listRecent, listForTask, summary), and a /settings/runs view that
mirrors the audit page's visual language.
Co-authored-by: Cursor <cursoragent@cursor.com>
