These files were loaded only by their own test_*_parity.gd and never by
the runtime (transitively checked, incl. client_phase_integration_system).
Removes 76 manifest implementation/evidence references across 18
contracts; contract docs get a note that conclusions based on them are
void. Live systems kept: chest, consumable, item_attr, metin_socket,
whisper_chat.
Full headless suite: no new failures (7 failing + 5 headless-hanging
render tests are identical before the deletion).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
