feat: Add proxy support and explicit model override for LLM pipeline

- Add ANTHROPIC_BASE_URL env var support in LLMManager and
  AnthropicProvider — enables local proxies (e.g. localhost:3456)
- Add MODEL env var to cli.py config dict — was missing, so explicit
  model selection via env var didn't reach LLMManager
- Skip model fallback chain when MODEL is explicitly set (not "auto") —
  prevents hitting rate-limited Claude models when using alternative
  models like gpt-5.3-codex through an Anthropic-compatible proxy
- Pass anthropic_base_url through config dict from cli.py

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: devatsecure

scripts/hybrid/cli.py

@@ -209,6 +209,8 @@ def main():
         "anthropic_api_key": os.getenv("ANTHROPIC_API_KEY"),
         "openai_api_key": os.getenv("OPENAI_API_KEY"),
         "ollama_endpoint": os.getenv("OLLAMA_ENDPOINT"),
+        "model": os.getenv("MODEL", "auto"),
+        "anthropic_base_url": os.getenv("ANTHROPIC_BASE_URL"),
     }
 
     # Resolve feature flags: CLI arg > env var > config_loader default

scripts/orchestrator/llm_manager.py

@@ -18,6 +18,7 @@
 """
 
 import logging
+import os
 import shutil
 
 from error_classifier import (
@@ -221,8 +222,12 @@ def initialize(self, provider: str = None) -> bool:
             self.model = self.get_model_name(provider)
 
             # For Anthropic, test model accessibility and fallback if needed
-            if provider == "anthropic":
+            # Skip fallback chain if model is explicitly set (not "auto")
+            explicit_model = self.config.get("model", "auto")
+            if provider == "anthropic" and explicit_model == "auto":
                 self.model = self._get_working_model_with_fallback(self.client, self.model)
+            elif provider == "anthropic":
+                logger.info(f"Using explicitly configured model: {self.model} (skipping fallback chain)")
 
             logger.info(f"Successfully initialized LLM Manager with {self.provider} / {self.model}")
             return True
@@ -251,6 +256,10 @@ def _get_client(self, provider: str):
                 if not api_key:
                     raise ValueError("ANTHROPIC_API_KEY not set")
 
+                base_url = self.config.get("anthropic_base_url") or os.environ.get("ANTHROPIC_BASE_URL")
+                if base_url:
+                    logger.info(f"Using Anthropic API via proxy: {base_url}")
+                    return Anthropic(api_key=api_key, base_url=base_url), "anthropic"
                 logger.info("Using Anthropic API")
                 return Anthropic(api_key=api_key), "anthropic"
             except ImportError:

scripts/providers/anthropic_provider.py

@@ -46,8 +46,13 @@ def _init_client(self):
         try:
             import anthropic
 
-            self.client = anthropic.Anthropic(api_key=self.api_key)
-            logger.info(f"✅ Anthropic provider initialized with model {self.model}")
+            base_url = os.environ.get("ANTHROPIC_BASE_URL")
+            if base_url:
+                self.client = anthropic.Anthropic(api_key=self.api_key, base_url=base_url)
+                logger.info(f"✅ Anthropic provider initialized via proxy with model {self.model}")
+            else:
+                self.client = anthropic.Anthropic(api_key=self.api_key)
+                logger.info(f"✅ Anthropic provider initialized with model {self.model}")
         except ImportError:
             raise ImportError("anthropic package not installed. Run: pip install anthropic")