The fake transport can't lie about being open, so the dead-pipe case is untestable

Where: test/fakeTransport.ts, lib/drivers/__tests__/ddp.connection.spec.ts, lib/drivers/__tests__/ddp.liveness.spec.ts.

Problem

The suite records this gap itself: readyState is written by the test, so "a real socket reporting OPEN over a dead pipe is unreachable through this seam."

That dead-pipe case is the entire reason Probe and the alive window exist. CONTEXT.md states it as the layer's central claim — a Socket the server has stopped answering still reads as open to the transport — and it is the one claim the tests cannot produce. Today the Liveness chain is exercised against a cooperating fake with hand-written state.

Fix

A fake transport mode where readyState stays OPEN and send succeeds while nothing ever comes back. Then the Liveness chain, alive(), connected and probe run against a genuinely silent socket instead of an obliging one.

Test infrastructure only, no production surface.

Start in test/fakeTransport.ts, then read the liveness and connection specs in lib/drivers/tests/ddp.liveness.spec.ts and lib/drivers/tests/ddp.connection.spec.ts. Run those tests to understand the current cooperating fake and verify the new mode keeps readyState OPEN, lets send succeed, and produces no responses so alive(), connected, and probe exercise the silent-socket case.