first update to external config values

config/retriex/prompt.yaml

@@ -0,0 +1,18 @@
+# Prompt budget and prompt rendering limits.
+# Existing prompt wording/rules remain in PromptBuilderConfig for this minimal-invasive round.
+parameters:
+  retriex.prompt.config:
+    budget:
+      chars_per_token: 4
+      history_padding_chars: 400
+      output_reserve_ratio: 0.25
+      output_reserve_min_tokens: 768
+      output_reserve_max_tokens: 6000
+      safety_reserve_ratio: 0.05
+      safety_reserve_min_tokens: 256
+      safety_reserve_max_tokens: 1024
+      min_prompt_budget_tokens: 1024
+    shop_results:
+      max_results_in_prompt: 24
+      detailed_max_count: 5
+    technical_product_keyword_match_threshold: 2