feat(providers): add Codex and Ollama provider runners with message adapters

v2/src/lib/providers/ollama.ts

@@ -0,0 +1,20 @@
+// Ollama Provider — metadata and capabilities for local Ollama models
+
+import type { ProviderMeta } from './types';
+
+export const OLLAMA_PROVIDER: ProviderMeta = {
+  id: 'ollama',
+  name: 'Ollama',
+  description: 'Local Ollama models via REST API',
+  capabilities: {
+    hasProfiles: false,
+    hasSkills: false,
+    hasModelSelection: true,
+    hasSandbox: false,
+    supportsSubagents: false,
+    supportsCost: false,
+    supportsResume: false,
+  },
+  sidecarRunner: 'ollama-runner.mjs',
+  defaultModel: 'qwen3:8b',
+};