chore: remove uncertain orphaned definitions

Co-authored-by: Copilot App <[email protected]>

tests/test_orphan_sweep.py

@@ -31,11 +31,6 @@ REGISTRATION_DECORATOR_PREFIXES = ("router.", "app.", "ui.page")
 # rationale. Removing the code means removing the entry; adding an entry means an
 # explicit decision to keep unreferenced code.
 KNOWN_ORPHANS: dict[str, str] = {
-    "BenchmarkManifest": (
-        "Benchmark manifest model in benchmarking.py with no current caller. "
-        "Uncertain - follow-up: confirm whether the benchmarking entrypoint is still "
-        "intended before removing."
-    ),
     "DocumentService.is_document_type_referenced": (
         "Read helper currently bypassed by callers in favor of direct delete guards. "
         "Retained for now to preserve service API stability during cleanup."
@@ -92,19 +87,6 @@ KNOWN_ORPHANS: dict[str, str] = {
         "Public read helper currently unused by runtime flows, but retained as part of "
         "the SourceService API pending endpoint consolidation."
     ),
-    "dispose_all_engines": (
-        "Engine lifecycle helper in db/engine.py. Uncertain - follow-up: operational "
-        "teardown utility with no runtime or test caller."
-    ),
-    "refresh_engine": (
-        "Engine lifecycle helper in db/engine.py. Uncertain - follow-up: paired with "
-        "dispose_all_engines and equally unreferenced."
-    ),
-    "summarize_error": (
-        "Error-presentation helper in ui/components/error_presenter.py that no page or "
-        "component calls. Uncertain - follow-up: superseded by the presenter's other "
-        "entrypoints."
-    ),
 }