Remove compat-all flag

Date: 2026-05-10 Area: engine

Removed the --compat-all meta-flag. It was originally added to give test262 a single switch that turns on every --compat-* option, but in practice it (a) hides which compatibility surface a given run actually depends on, (b) silently widens its own meaning whenever a new --compat-* flag lands, and (c) needs the same fan-out logic kept in sync in three frontends (GocciaScriptLoaderBare.dpr, Goccia.CLI.Application.pas, GocciaBundler.dpr). Consumers now enumerate the specific flags they need; scripts/run_test262_suite.ts lists the required --compat-* flags explicitly for the conformance corpus. The individual compat flags themselves and their goccia.json keys are unchanged.