AGENTS.md: no direct commits to main, all changes via feature branches

internal/models/model.go

@@ -1,3 +1,4 @@
+// Package models defines the data models used by the chat application.
 package models
 
 import "database/sql"
@@ -13,6 +14,7 @@ type Base struct {
 	db DB
 }
 
+// SetDB injects the database reference into a model.
 func (b *Base) SetDB(d DB) {
 	b.db = d
 }