piToolsOverride function
pi's runtime availability scope: every known tool id off except
piToolIds. Applied as the DEEPEST scope in rebuildToolAvailability,
so it pins the surface exactly — --tools and FA_TOOLS cannot widen
a benchmark run.
Implementation
ToolsConfig piToolsOverride() => ToolsConfig(
tools: {for (final id in knownToolIds) id: piToolIds.contains(id)},
);