cli(fix[error-handling]): Use logging.exception for better error reporting

why: Follow best practices for exception logging and provide better debugging info
what:
- Replace log.error with log.exception in exception handlers
- Maintain existing debug traceback functionality
- Apply to both add.py and add_from_fs.py modules

Author: tony

src/vcspull/cli/add.py

@@ -102,7 +102,7 @@ def add_repo(
                 )
                 return
         except Exception:
-            log.error(f"Error loading YAML from {config_file_path}. Aborting.")
+            log.exception(f"Error loading YAML from {config_file_path}. Aborting.")
             if log.isEnabledFor(logging.DEBUG):
                 import traceback
 
@@ -159,7 +159,7 @@ def add_repo(
             f"under '{base_dir_key}'.",
         )
     except Exception:
-        log.error(f"Error saving config to {config_file_path}")
+        log.exception(f"Error saving config to {config_file_path}")
         if log.isEnabledFor(logging.DEBUG):
             import traceback
 

src/vcspull/cli/add_from_fs.py

@@ -136,7 +136,7 @@ def add_from_filesystem(
                 )
                 return
         except Exception:
-            log.error(f"Error loading YAML from {config_file_path}. Aborting.")
+            log.exception(f"Error loading YAML from {config_file_path}. Aborting.")
             if log.isEnabledFor(logging.DEBUG):
                 import traceback
 
@@ -223,7 +223,7 @@ def add_from_filesystem(
 
     repos_to_add: list[tuple[str, str, str]] = []
     existing_repos: list[tuple[str, str, str]] = []  # (name, url, key)
-    
+
     for name, url, key in found_repos:
         target_section = raw_config.get(key, {})
         if isinstance(target_section, dict) and name in target_section:
@@ -235,10 +235,13 @@ def add_from_filesystem(
         log.info(f"Found {len(existing_repos)} existing repositories in configuration:")
         for name, url, key in existing_repos:
             log.info(f"  - {name} ({url}) at {key}{name} in {config_file_path}")
-    
+
     if not repos_to_add:
         if existing_repos:
-            log.info("All found repositories already exist in the configuration. Nothing to do.")
+            log.info(
+                "All found repositories already exist in the configuration. "
+                "Nothing to do."
+            )
         return
 
     if not yes:
@@ -270,7 +273,7 @@ def add_from_filesystem(
             save_config_yaml(config_file_path, raw_config)
             log.info(f"Successfully updated {config_file_path}.")
         except Exception:
-            log.error(f"Error saving config to {config_file_path}")
+            log.exception(f"Error saving config to {config_file_path}")
             if log.isEnabledFor(logging.DEBUG):
                 import traceback