TIER-2 READ conductor/code_styleguides/error_handling.md end-to-end before Phase 3: refactor(mcp_client): migrate L229 search_files to Result[T] (Phase 3 site 2)

Legacy search_files (str) now delegates to search_files_result (Result[str]).
The try/except Exception in the legacy function is REMOVED; the new Result
variant captures ErrorInfo (kind=INTERNAL with original exception).

Audit: mcp_client BC count 39 -> 38.

src/mcp_client.py

@@ -198,31 +198,15 @@ def search_files(path: str, pattern: str) -> str:
  """
  Search for files matching a glob pattern within path.
  pattern examples: '*.py', '**/*.toml', 'src/**/*.rs'
+
+ Thin wrapper over search_files_result; the legacy str shape is preserved
+ for backward compatibility, but the try/except Exception lives in the
+ Result variant (where it can capture ErrorInfo with kind=INTERNAL).
  """
- p, err = _resolve_and_check(path)
- if err or p is None:
-  return err
- if not p.is_dir():
-  return f"ERROR: not a directory: {path}"
- try:
-  matches = sorted(p.glob(pattern))
-  if not matches:
-   return f"No files matched '{pattern}' in {path}"
-  lines = [f"Search '{pattern}' in {p}:", ""]
-  count = 0
-  for m in matches:
-  # Blacklist check
-   name = m.name.lower()
-   if name == "history.toml" or name.endswith("_history.toml"):
-    continue
-   rel = m.relative_to(p)
-   kind = "file" if m.is_file() else "dir "
-   lines.append(f"  [{kind}]  {rel}")
-   count += 1
-  lines.append(f"  ({count} match(es))")
-  return "\n".join(lines)
- except Exception as e:
-  return f"ERROR searching '{path}': {e}"
+ resolved = search_files_result(path, pattern)
+ if resolved.ok:
+  return resolved.data
+ return "; ".join(e.ui_message() for e in resolved.errors)
 
 def list_directory(path: str) -> str:
  """List entries in a directory. Returns a compact text table."""