fix: follow a finished run's logs through the stream endpoint

[socksy]

tower apps logs --follow on a just-finished run can print nothing: the follow path fetched stored logs once, and the store lags a run's terminal status. This is why the monorepo CLI regression job fails consistently on cli_runs.feature:58. Now every follow attaches to the log stream, which replays from the start and closes itself; the finished-run special cases are deleted. The first commit gives the mock the same persistence lag, reproducing the failure; the second makes it pass. Full suite green against the mock and a real backend at develop.

[coderabbitai]

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