Add TRS-80, RX-78, Sega AI entries; refactor tools

Add many MAME/MESS BIOS entries (TRS-80 family, Bandai RX-78, Sega AI) and update docs/navigation counts (README, mkdocs). Remove empty supplemental file references from database.json and update generated timestamps and totals. Harden and refactor tooling: add MAX_RESPONSE_SIZE limited reader in base_scraper, make target scrapers an abstract base, narrow exception handling in the Batocera targets parser, and switch generate_pack.py and verify.py to use build_target_cores_cache (simplifies target config loading and error handling). verify.py also loads supplemental cross-reference names and accepts them through verify_platform. Update tests to import from updated modules (validation/truth). Misc: small bugfix for case-insensitive path conflict check.

scripts/scraper/targets/batocera_targets_scraper.py

@@ -152,7 +152,7 @@ def _condition_holds(condition: str, active: frozenset[str]) -> bool:
     try:
         result, _ = _check_condition(tokens, 0, active)
         return result
-    except Exception:
+    except (IndexError, ValueError, TypeError):
         return True  # conservative: include on parse failure