docs: add package comments to public and template packages

pkg/graphql.go

@@ -1,3 +1,4 @@
+// Package graphql provides a GraphQL client for the AniList API.
 package graphql
 
 import (

pkg/net/limits.go

@@ -1,3 +1,4 @@
+// Package netutil provides HTTP networking utilities including rate limiting and proxy support.
 package netutil
 
 // Common size limits used when reading upstream responses.

templates/renderer.go

@@ -1,3 +1,4 @@
+// Package templates provides HTML template rendering with custom functions.
 package templates
 
 import (