feat!: redesign model config + auth profiles

src/commands/configure.ts

@@ -32,6 +32,7 @@ import {
 } from "./antigravity-oauth.js";
 import { healthCommand } from "./health.js";
 import {
+  applyAuthProfileConfig,
   applyMinimaxConfig,
   setAnthropicApiKey,
   writeOAuthCredentials,
@@ -275,6 +276,11 @@ async function promptAuthConfig(
       spin.stop("OAuth complete");
       if (oauthCreds) {
         await writeOAuthCredentials("anthropic", oauthCreds);
+        next = applyAuthProfileConfig(next, {
+          profileId: "anthropic:default",
+          provider: "anthropic",
+          mode: "oauth",
+        });
       }
     } catch (err) {
       spin.stop("OAuth failed");
@@ -316,12 +322,30 @@ async function promptAuthConfig(
       spin.stop("Antigravity OAuth complete");
       if (oauthCreds) {
         await writeOAuthCredentials("google-antigravity", oauthCreds);
+        next = applyAuthProfileConfig(next, {
+          profileId: "google-antigravity:default",
+          provider: "google-antigravity",
+          mode: "oauth",
+        });
         // Set default model to Claude Opus 4.5 via Antigravity
         next = {
           ...next,
           agent: {
             ...next.agent,
-            model: "google-antigravity/claude-opus-4-5-thinking",
+            model: {
+              ...((next.agent?.model as {
+                primary?: string;
+                fallbacks?: string[];
+              }) ?? {}),
+              primary: "google-antigravity/claude-opus-4-5-thinking",
+            },
+            models: {
+              ...next.agent?.models,
+              "google-antigravity/claude-opus-4-5-thinking":
+                next.agent?.models?.[
+                  "google-antigravity/claude-opus-4-5-thinking"
+                ] ?? {},
+            },
           },
         };
         note(
@@ -342,6 +366,11 @@ async function promptAuthConfig(
       runtime,
     );
     await setAnthropicApiKey(String(key).trim());
+    next = applyAuthProfileConfig(next, {
+      profileId: "anthropic:default",
+      provider: "anthropic",
+      mode: "api_key",
+    });
   } else if (authChoice === "minimax") {
     next = applyMinimaxConfig(next);
   }
@@ -349,7 +378,10 @@ async function promptAuthConfig(
   const modelInput = guardCancel(
     await text({
       message: "Default model (blank to keep)",
-      initialValue: next.agent?.model ?? "",
+      initialValue:
+        typeof next.agent?.model === "string"
+          ? next.agent?.model
+          : (next.agent?.model?.primary ?? ""),
     }),
     runtime,
   );
@@ -359,7 +391,17 @@ async function promptAuthConfig(
       ...next,
       agent: {
         ...next.agent,
-        model,
+        model: {
+          ...((next.agent?.model as {
+            primary?: string;
+            fallbacks?: string[];
+          }) ?? {}),
+          primary: model,
+        },
+        models: {
+          ...next.agent?.models,
+          [model]: next.agent?.models?.[model] ?? {},
+        },
       },
     };
   }