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setUp() spawned the daemon and polled only for the unix-socket file to exist before proceeding to connect(). Under concurrent CI-runner load the socket file can appear (created by bind()) before the daemon calls listen(), so the client's immediate connect() raced ahead and hit ConnectionRefusedError: [Errno 111], erroring the whole suite in setUp(). wait_ready() now attempts a real socket.connect() in a retry loop (catching ConnectionRefusedError/FileNotFoundError) until a connection actually succeeds (then closes it) or the same 5s deadline elapses, at which point it fails exactly as before. Readiness is now "the daemon is actually accepting connections," not "a file happens to exist," eliminating the TOCTOU race. Scope: only wait_ready() in this file changed. Zero assertion changes, zero daemon/lease-broker source changes, zero gate-timeout relaxation. Closes #897