docs: add comments for hf_token usage in bug localization functions

main.py

@@ -61,6 +61,8 @@ async def multi_module_bug_localization(request: MultiModuleRequest, ctx: Contex
     client = ds_ctx.client
 
     api_url = API_CONFIG["api_base_url"] + API_CONFIG["api_multimodule_endpoint"]
+    
+    # hf_token to access private HF Space serving Defect Solver API
     hf_token = API_CONFIG.get("hf_access_token", None)
 
     # Get per-user API key from MCP Context
@@ -138,6 +140,8 @@ async def single_module_bug_localization(request: SingleModuleRequest, ctx: Cont
     client = ds_ctx.client
 
     api_url = API_CONFIG["api_base_url"] + API_CONFIG["api_singlemodule_endpoint"]
+
+    # hf token to access Defect Solver API
     hf_token = API_CONFIG.get("hf_access_token", None)
 
     # Get per-user API key from MCP Context
@@ -214,6 +218,8 @@ async def search_space_routing(request: SearchSpaceRoutingRequest, ctx: Context)
     client = ds_ctx.client
 
     api_url = API_CONFIG["api_base_url"] + API_CONFIG["api_searchspace_endpoint"]
+
+    # hf_token to access private HF Space serving Defect Solver API
     hf_token = API_CONFIG.get("hf_access_token", None)
 
     # Get per-user API key from MCP Context