refactor: framework modules log through diary components

- Each module logs through diary.For(<package>): cabana, lagoon, attach, cooler, postcard, beachcomber, lighthouse, centrifugo, flare, phrasebook, wristband, bouncer
- App-published *slog.Logger overrides stay first; messages and attributes unchanged
- sunscreen: InstallDefault documented as the compatibility entry point; diary wraps every channel
- READMEs list diary as a dependency; logging docs: plugins use diary.For

modules/cooler/memory.go

@@ -56,7 +56,7 @@ func NewMemoryCache(prefix string, maxEntries int) (Cache, error) {
 	if err != nil {
 		return nil, fmt.Errorf("cooler: memory cache: %w", err)
 	}
-	return &memoryCache{c: c, prefix: prefix, warn: newWarner(slog.Default())}, nil
+	return &memoryCache{c: c, prefix: prefix, warn: newWarner(moduleLog)}, nil
 }
 
 func (m *memoryCache) key(k string) string { return m.prefix + "cache:" + k }