docs: expand .env example to show max/large values; add SUMM_TIMEOUT and summarizer tunables\n\nfeat: summarizer improvements\n- readability extraction for articles\n- image links passed to model as vision inputs\n- configurable max groups/links/bytes and timeout\n- higher default ceilings; resilient fallback summary

internal/config/config.go

@@ -28,16 +28,18 @@ type Config struct {
 	PushoverAPIToken string
 
 	// Summarizer / LLM
-	LLMProvider      string
-	OpenAIAPIKey     string
-	OpenAIBaseURL    string
-	OpenAIModel      string
-	OpenAIMaxTokens  int
-	SummFollowLinks  bool
-	SummLinkTimeout  time.Duration
-	SummLinkMaxBytes int
-	SummGroupWindow  time.Duration
-	SummMaxLinks     int
+	LLMProvider       string
+	OpenAIAPIKey      string
+	OpenAIBaseURL     string
+	OpenAIModel       string
+	OpenAIMaxTokens   int
+	SummFollowLinks   bool
+	SummLinkTimeout   time.Duration
+	SummLinkMaxBytes  int
+	SummGroupWindow   time.Duration
+	SummMaxLinks      int
+	SummMaxGroups     int
+	SummarizerTimeout time.Duration
 
 	// Digests
 	DigestCron           string
@@ -90,6 +92,8 @@ func FromEnv() Config {
 	cfg.SummLinkMaxBytes = getEnvInt("SUMM_LINK_MAX_BYTES", 262144)
 	cfg.SummGroupWindow = getEnvDuration("SUMM_GROUP_WINDOW", 90*time.Second)
 	cfg.SummMaxLinks = getEnvInt("SUMM_MAX_LINKS", 5)
+	cfg.SummMaxGroups = getEnvInt("SUMM_MAX_GROUPS", 0)
+	cfg.SummarizerTimeout = getEnvDuration("SUMM_TIMEOUT", 5*time.Minute)
 
 	cfg.DigestCron = getEnv("DIGEST_CRON", "0 */6 * * *")
 	cfg.DigestWindow = getEnvDuration("DIGEST_WINDOW", 6*time.Hour)