wip: preserve local engine and agent workflow changes before ganjihong refactor integration

backend/.env

@@ -2,7 +2,7 @@
 # CDSL_DEFAULT_PROVIDER=deepseek
 # CDSL_DEFAULT_MODEL=deepseek-v4-flash
 CDSL_DEFAULT_PROVIDER=openai
-CDSL_DEFAULT_MODEL=gpt-5.4-mini
+CDSL_DEFAULT_MODEL=gpt-5.5
 
 # DeepSeek. Fill in your own API key below.
 CDSL_LLM_BASE_URL=https://api.deepseek.com/v1
@@ -11,9 +11,6 @@ CDSL_LLM_MODEL=deepseek-v4-flash,deepseek-v4-pro,deepseek-v4-flash-vision-exp
 CDSL_LLM_TIMEOUT_S=90
 CDSL_DEEPSEEK_VISION_MODELS=deepseek-v4-flash-vision-exp
 
-# Final autonomous-task publication uses this independent vision reviewer.
-CDSL_REVIEW_PROVIDER=openai
-CDSL_REVIEW_MODEL=gpt-5.5
 
 # Optional OpenAI provider. Comma-separate enabled models; list vision models
 # separately so image attachments can be routed safely.
@@ -30,13 +27,3 @@ CDSL_KIMI_BASE_URL=https://api.moonshot.cn/v1
 CDSL_KIMI_API_KEY=
 CDSL_KIMI_MODELS=moonshot-v1-8k
 CDSL_KIMI_VISION_MODELS=
-
-# Autonomous CDSL agent limits. These protect an active modelling head, not
-# the total feature count of a CAD task.
-CDSL_AGENT_TOOL_CALLS_PER_CYCLE=12
-CDSL_AGENT_CANDIDATE_ATTEMPTS_PER_HEAD=3
-CDSL_AGENT_CONSECUTIVE_NO_PROGRESS_LIMIT=6
-CDSL_AGENT_FORMAT_ERROR_REPEAT_LIMIT=3
-CDSL_AGENT_MAX_FEATURES_PER_FRAGMENT=6
-CDSL_AGENT_CONTEXT_CHAR_LIMIT=14000
-CDSL_AGENT_RENDER_CACHE=true