fix(config): add firecrawl and readability to web fetch schema

The tools.web.fetch schema used .strict() (additionalProperties: false)
and was missing the readability boolean and firecrawl nested object.
This caused config validation to reject firecrawl settings even though
the code in web-fetch.ts and the uiHints already supported them.

Add ToolsWebFetchFirecrawlSchema with all six documented properties
(enabled, apiKey, baseUrl, onlyMainContent, maxAgeMs, timeoutSeconds)
and the readability boolean to ToolsWebFetchSchema.

Fixes #2527

src/config/zod-schema.agent-runtime.ts

@@ -182,6 +182,18 @@ export const ToolsWebSearchSchema = z
   .strict()
   .optional();
 
+export const ToolsWebFetchFirecrawlSchema = z
+  .object({
+    enabled: z.boolean().optional(),
+    apiKey: z.string().optional(),
+    baseUrl: z.string().optional(),
+    onlyMainContent: z.boolean().optional(),
+    maxAgeMs: z.number().nonnegative().optional(),
+    timeoutSeconds: z.number().int().positive().optional(),
+  })
+  .strict()
+  .optional();
+
 export const ToolsWebFetchSchema = z
   .object({
     enabled: z.boolean().optional(),
@@ -190,6 +202,8 @@ export const ToolsWebFetchSchema = z
     cacheTtlMinutes: z.number().nonnegative().optional(),
     maxRedirects: z.number().int().nonnegative().optional(),
     userAgent: z.string().optional(),
+    readability: z.boolean().optional(),
+    firecrawl: ToolsWebFetchFirecrawlSchema,
   })
   .strict()
   .optional();