fix: add explanatory comment to empty except block in layer resolution

Address code-quality review: explain why PresetValidationError is
intentionally caught and ignored (falls back to default 'replace'
strategy so layer resolution continues).

Author: mnriem

src/specify_cli/presets.py

@@ -1966,6 +1966,8 @@ def _find_in_subdirs(base_dir: Path) -> Optional[Path]:
                                     strategy = tmpl.get("strategy", "replace")
                                     break
                         except PresetValidationError:
+                            # Invalid manifest — fall back to default "replace"
+                            # strategy so layer resolution still works.
                             pass
                     version = metadata.get("version", "?") if metadata else "?"
                     layers.append({