startsExternallyDriven

One-shot: only the very first store construction is gated ahead of logic.

io.github.syrou.reaktiv.introspection.tooling.ToolingLogic is rebuilt on every store reset, so a standing true here would re-gate the store during the reset that recovers from a failed handshake and freeze it permanently. Later follower entries go through beginExternalControl on role assignment instead.