feat: add models scan and fallbacks

src/config/schema.ts

@@ -88,6 +88,7 @@ const FIELD_LABELS: Record<string, string> = {
   "gateway.reload.debounceMs": "Config Reload Debounce (ms)",
   "agent.workspace": "Workspace",
   "agent.model": "Default Model",
+  "agent.modelFallbacks": "Model Fallbacks",
   "ui.seamColor": "Accent Color",
   "browser.controlUrl": "Browser Control URL",
   "session.agentToAgent.maxPingPongTurns": "Agent-to-Agent Ping-Pong Turns",
@@ -111,6 +112,8 @@ const FIELD_HELP: Record<string, string> = {
     'Hot reload strategy for config changes ("hybrid" recommended).',
   "gateway.reload.debounceMs":
     "Debounce window (ms) before applying config changes.",
+  "agent.modelFallbacks":
+    "Ordered fallback models (provider/model). Used when the primary model fails.",
   "session.agentToAgent.maxPingPongTurns":
     "Max reply-back turns between requester and target (0–5).",
 };

src/config/sessions.ts

@@ -50,6 +50,7 @@ export type SessionEntry = {
   inputTokens?: number;
   outputTokens?: number;
   totalTokens?: number;
+  modelProvider?: string;
   model?: string;
   contextTokens?: number;
   displayName?: string;
@@ -335,6 +336,7 @@ export async function updateLastRoute(params: {
     inputTokens: existing?.inputTokens,
     outputTokens: existing?.outputTokens,
     totalTokens: existing?.totalTokens,
+    modelProvider: existing?.modelProvider,
     model: existing?.model,
     contextTokens: existing?.contextTokens,
     displayName: existing?.displayName,

src/config/types.ts

@@ -666,6 +666,8 @@ export type ClawdbotConfig = {
     allowedModels?: string[];
     /** Optional model aliases for /model (alias -> provider/model). */
     modelAliases?: Record<string, string>;
+    /** Ordered fallback models (provider/model). */
+    modelFallbacks?: string[];
     /** Optional display-only context window override (used for % in status UIs). */
     contextTokens?: number;
     /** Default thinking level when no /think directive is present. */

src/config/zod-schema.ts

@@ -366,6 +366,7 @@ export const ClawdbotSchema = z.object({
       workspace: z.string().optional(),
       allowedModels: z.array(z.string()).optional(),
       modelAliases: z.record(z.string(), z.string()).optional(),
+      modelFallbacks: z.array(z.string()).optional(),
       contextTokens: z.number().int().positive().optional(),
       thinkingDefault: z
         .union([