修改agent流程，分步构建cdsl

backend/.env

@@ -1,8 +1,8 @@
 # Default provider. Only providers with an API key are exposed to the UI.
-CDSL_DEFAULT_PROVIDER=deepseek
-CDSL_DEFAULT_MODEL=deepseek-v4-flash
-# CDSL_DEFAULT_PROVIDER=openai
-# CDSL_DEFAULT_MODEL=gpt-5.5
+# CDSL_DEFAULT_PROVIDER=deepseek
+# CDSL_DEFAULT_MODEL=deepseek-v4-flash
+CDSL_DEFAULT_PROVIDER=openai
+CDSL_DEFAULT_MODEL=gpt-5.5
 
 # DeepSeek. Fill in your own API key below.
 CDSL_LLM_BASE_URL=https://api.deepseek.com/v1
@@ -11,7 +11,7 @@ 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
 
-# Incremental generation uses a separate vision-capable model for checkpoint review.
+# Final autonomous-task publication uses this independent vision reviewer.
 CDSL_REVIEW_PROVIDER=deepseek
 CDSL_REVIEW_MODEL=deepseek-v4-flash-vision-exp
 
@@ -21,19 +21,22 @@ CDSL_OPENAI_BASE_URL=https://api.vip1129.cc/v1
 CDSL_OPENAI_API_KEY=sk-6586c229d77de8c421ba98e7eb0d9c6bb10f08ebc796de946ed17cf8d0d7a229
 CDSL_OPENAI_MODELS=gpt-5.5,gpt-5.6-luna
 CDSL_OPENAI_VISION_MODELS=gpt-5.5,gpt-5.6-luna
+# Supported values are model- and endpoint-dependent: low, medium, high.
+# gpt-5.5 defaults to medium, but setting it explicitly keeps requests stable.
+CDSL_OPENAI_REASONING_EFFORT=medium
 
 # Optional Kimi provider.
 CDSL_KIMI_BASE_URL=https://api.moonshot.cn/v1
 CDSL_KIMI_API_KEY=
 CDSL_KIMI_MODELS=moonshot-v1-8k
 CDSL_KIMI_VISION_MODELS=
-# Enable only after verifying that the selected endpoint supports strict
-# OpenAI-compatible function schemas. This affects generate_cdsl_model's JSON
-# arguments only, never ordinary assistant chat text.
-CDSL_DEEPSEEK_STRICT_TOOL_SCHEMA=false
-CDSL_OPENAI_STRICT_TOOL_SCHEMA=false
-CDSL_KIMI_STRICT_TOOL_SCHEMA=true
-CDSL_MAX_REPAIR_ATTEMPTS=4
-# To enable individual models instead of every model from a provider, keep the
-# provider-wide switch false and list exact IDs, for example:
-# CDSL_OPENAI_STRICT_TOOL_MODELS=gpt-4.1
+
+# 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