fix: make model validation token budget configurable

tests/unit/model-validation.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest"
+import {
+    DEFAULT_MODEL_VALIDATION_MAX_TOKENS,
+    MAX_MODEL_VALIDATION_MAX_TOKENS,
+    parseModelValidationMaxTokens,
+    resolveModelValidationMaxTokens,
+} from "@/lib/model-validation"
+
+describe("model validation token budget", () => {
+    it("defaults to a larger reasoning-friendly budget", () => {
+        expect(resolveModelValidationMaxTokens()).toBe(
+            DEFAULT_MODEL_VALIDATION_MAX_TOKENS,
+        )
+    })
+
+    it("prefers the first valid source", () => {
+        expect(resolveModelValidationMaxTokens(2000, 3000)).toBe(2000)
+        expect(resolveModelValidationMaxTokens("bad", "3000")).toBe(3000)
+    })
+
+    it("rejects invalid values", () => {
+        expect(parseModelValidationMaxTokens(0)).toBeNull()
+        expect(parseModelValidationMaxTokens(-1)).toBeNull()
+        expect(parseModelValidationMaxTokens(1.5)).toBeNull()
+        expect(parseModelValidationMaxTokens("abc")).toBeNull()
+    })
+
+    it("caps very large values", () => {
+        expect(
+            resolveModelValidationMaxTokens(
+                MAX_MODEL_VALIDATION_MAX_TOKENS + 1,
+            ),
+        ).toBe(MAX_MODEL_VALIDATION_MAX_TOKENS)
+    })
+})