fix: ensure tool schema always includes name field in get_definitions (#3811)

When a tool plugin registers a schema without an explicit 'name' key,
get_definitions() crashes with KeyError:

    available_tool_names = {t["function"]["name"] for t in filtered_tools}

Fix: always merge entry.name into schema so 'name' is never missing.

Refs: #3729

Co-authored-by: ekkoitac <ekko.itac@gmail.com>

tools/registry.py

@@ -115,7 +115,9 @@ class ToolRegistry:
                     if not quiet:
                         logger.debug("Tool %s unavailable (check failed)", name)
                     continue
-            result.append({"type": "function", "function": entry.schema})
+            # Ensure schema always has a "name" field — use entry.name as fallback
+            schema_with_name = {**entry.schema, "name": entry.name}
+            result.append({"type": "function", "function": schema_with_name})
         return result
 
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