fix: auto-enable extendedContext when legacy [1m] models found in config

Configs with model: "opus[1m]" (old format, no extendedContext key) were
silently downgraded to 200K context because migration stripped [1m]
without setting extendedContext=true. Now detects legacy [1m] in any
model value and auto-enables extended context to preserve user intent.

Author: maxritter

console/src/services/worker/http/routes/SettingsRoutes.ts

@@ -71,6 +71,9 @@ export class SettingsRoutes extends BaseRouteHandler {
   }
 
   private mergeWithDefaults(raw: Record<string, unknown>): ModelSettings {
+    let hasLegacy1m =
+      typeof raw.model === "string" && raw.model.includes("[1m]");
+
     let mainModel =
       typeof raw.model === "string"
         ? SettingsRoutes.stripLegacy1m(raw.model)
@@ -92,6 +95,7 @@ export class SettingsRoutes extends BaseRouteHandler {
         rawCommands as Record<string, unknown>,
       )) {
         if (typeof v === "string") {
+          if (v.includes("[1m]")) hasLegacy1m = true;
           const stripped = SettingsRoutes.stripLegacy1m(v);
           if (MODEL_CHOICES.includes(stripped)) {
             mergedCommands[k] = stripped;
@@ -119,7 +123,7 @@ export class SettingsRoutes extends BaseRouteHandler {
       }
     }
 
-    const extendedContext = raw.extendedContext === true;
+    const extendedContext = raw.extendedContext === true || hasLegacy1m;
 
     return {
       model: mainModel,

console/tests/settings-routes.test.ts

@@ -152,7 +152,7 @@ describe('SettingsRoutes', () => {
       expect(m.body.commands['spec-plan']).toBe(DEFAULT_SETTINGS.commands['spec-plan']);
     });
 
-    it('should strip legacy 1m model without enabling extendedContext', async () => {
+    it('should auto-enable extendedContext when legacy 1m model found', async () => {
       fs.writeFileSync(configPath, JSON.stringify({ model: 'opus[1m]' }));
 
       const m = makeMockRes();
@@ -161,10 +161,10 @@ describe('SettingsRoutes', () => {
       await (routes as any).handleGet(req as Request, m.res as Response);
 
       expect(m.body.model).toBe('opus');
-      expect(m.body.extendedContext).toBe(false);
+      expect(m.body.extendedContext).toBe(true);
     });
 
-    it('should strip legacy 1m commands without enabling extendedContext', async () => {
+    it('should auto-enable extendedContext when legacy 1m commands found', async () => {
       fs.writeFileSync(configPath, JSON.stringify({ model: 'opus', commands: { spec: 'sonnet[1m]' } }));
 
       const m = makeMockRes();
@@ -173,7 +173,7 @@ describe('SettingsRoutes', () => {
       await (routes as any).handleGet(req as Request, m.res as Response);
 
       expect(m.body.commands.spec).toBe('sonnet');
-      expect(m.body.extendedContext).toBe(false);
+      expect(m.body.extendedContext).toBe(true);
     });
   });