refactor: Remove unused cfg parameter from get_instance_name()

- Remove unused `cfg: ConfigParser | None = None` parameter from get_instance_name()
- Remove corresponding docstring documentation for the parameter
- Remove now-unused `from configparser import ConfigParser` import

The parameter was marked as "for backward compatibility" but was never used
in the function body (it always used config_manager instead), and none of
the 8 call sites passed any arguments.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
(cherry picked from commit 24a886a)

progress.md

@@ -0,0 +1,14 @@
+# Progress Log
+
+## 2026-01-18: Remove unused `cfg` parameter from `get_instance_name()`
+
+**File:** `remote/utils.py`
+
+**Issue:** The `get_instance_name()` function had an unused parameter `cfg: ConfigParser | None = None`. The docstring mentioned it was for "backward compatibility" but:
+1. The parameter was never used inside the function
+2. All callers (8 call sites across instance.py, ami.py, snapshot.py, volume.py) called the function without arguments
+
+**Changes:**
+- Removed the unused `cfg` parameter from the function signature
+- Removed the corresponding parameter documentation from the docstring
+- Removed the now-unused `from configparser import ConfigParser` import

remote/utils.py

@@ -1,4 +1,3 @@
-from configparser import ConfigParser
 from datetime import datetime, timezone
 from functools import lru_cache
 from typing import TYPE_CHECKING, Any, cast
@@ -281,12 +280,9 @@ def get_instance_dns(instance_id: str) -> str:
         raise AWSServiceError("EC2", "describe_instances", error_code, error_message)
 
 
-def get_instance_name(cfg: ConfigParser | None = None) -> str:
+def get_instance_name() -> str:
     """Returns the name of the instance as defined in the config file.
 
-    Args:
-        cfg: Legacy config parser (for backward compatibility)
-
     Returns:
         str: Instance name if found