[codex] wire omnigent desktop provider

[jasonkneen]

Summary

• Add Omnigent to the desktop built-in chat provider catalog and picker with the daemon-compatible omnigent:default agent option.
• Route Omnigent chat turns through daemon /chat/job/* only, including a guard so it cannot fall through to the in-process runtime path.
• Add AppSettings.omnigent defaults matching the daemon settings shape and forward that object in /chat/job/start requests.
• Add focused desktop wiring coverage for the picker/settings/pass-through contract.

Validation

• node --test test/model-filter.test.ts test/hermes-provider-models.test.ts test/omnigent-desktop-wiring.test.ts passes.
• npm run build passes.
• npm run typecheck currently fails on unrelated baseline issues: packages/codesurf-daemon/src/client.ts unused DaemonPersona, missing nested vitest types for packages/contex-relay, and existing renderer unused/type errors in App.tsx, AppCanvasConnections.tsx, useAppSessionOrchestration.ts, useAppWorkspaceOrchestration.ts, and useTitleTooltips.ts.

Deferred

• I did not add a full Omnigent settings editor; the visible Settings > Providers panel is for generation providers, not chat providers. The required type/defaults and daemon pass-through are included.

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