fix

apps/api/internal/processing/llm_json.go

@@ -15,24 +15,33 @@ const (
 	// spend thousands of tokens in reasoning_content before message.content.
 	// Formula HTML JSON often needs a large completion budget; 4096 hit
 	// finish_reason=length with empty/truncated content in live enhance.
-	MaxTokensEnhance = 16384
+	// GPT-5.6 max_completion_tokens includes hidden reasoning tokens — keep
+	// this high so multi-section HTML descriptions are not truncated.
+	MaxTokensEnhance = 24576
 	// MaxTokensEnhanceRetry is the one-shot length-cap bump ceiling used by
 	// OpenAIClient when finish_reason=length yields empty or unparseable JSON.
-	MaxTokensEnhanceRetry = 32768
+	MaxTokensEnhanceRetry = 40960
 	MaxTokensSEO          = 180
 	MaxTokensCampaign     = 650
-	MaxProductDescRunes   = 400
-	MaxAttrKeys           = 10
-	MaxAttrValueRunes     = 60
-	MaxBrandInjectRunes   = 500
-	MaxCampaignProducts   = 8
-	MaxCampaignNameRunes  = 80
+	// MaxProductDescRunes caps source description text fed into enhance prompts.
+	// Kept large enough for existing long/HTML descriptions so the model can
+	// rewrite factually instead of inventing from a truncated stub.
+	MaxProductDescRunes = 3500
+	MaxAttrKeys         = 10
+	MaxAttrValueRunes   = 60
+	MaxBrandInjectRunes = 500
+	MaxCampaignProducts = 8
+	MaxCampaignNameRunes = 80
 )
 
 // CompleteOptions tunes a single chat completion for structured tasks.
 type CompleteOptions struct {
 	MaxTokens   int
-	Temperature float64 // 0 → client default (≤0.3 for structured)
+	Temperature float64 // 0 → client default (≤0.3 for structured); omitted on GPT-5/o-series
+	// ReasoningEffort is Chat Completions reasoning_effort for GPT-5 / o-series.
+	// Empty → auto: "none" for tiny/probe budgets, "low" for content-heavy calls
+	// (long formula HTML) so visible tokens are not eaten by deep reasoning.
+	ReasoningEffort string
 }
 
 // CompleterWithOptions is optional; OpenAIClient implements it.
@@ -205,7 +214,9 @@ func CompactBrandPrompt(block string) string {
 	return truncateRunes(SanitizeText(block), MaxBrandInjectRunes)
 }
 
-// ProductEnhanceUser builds a short user prompt for title/description enhance.
+// ProductEnhanceUser builds the compact user prompt for title/description enhance.
+// Source description is capped at MaxProductDescRunes so long/HTML inputs stay available
+// for factual rewrite (not invented from a short stub).
 func ProductEnhanceUser(category, name, description string, attrs map[string]any) string {
 	var b strings.Builder
 	b.WriteString("Category: ")