refactor(lint): tighten channel and config defaults

src/config/types.channels.ts

@@ -50,6 +50,5 @@ export interface ChannelsConfig {
   /** Map provider -> channel id -> model override. */
   modelByChannel?: ChannelModelByChannelConfig;
   /** Channel sections are plugin-owned; concrete channel files augment this interface. */
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  [key: string]: any;
+  [key: string]: unknown;
 }

src/config/zod-schema.providers.ts

@@ -100,7 +100,7 @@ function normalizeBundledChannelConfigs(
       continue;
     }
     next ??= { ...value };
-    next[channelId] = parsed.data as ChannelsConfig[string];
+    next[channelId] = parsed.data;
   }
 
   return next ?? value;