Server: guarantee terminal shutdown after cleanup failures

[jzhvymetal]

Summary

• ensure terminal shutdown state is reached when linkage or plugin cleanup throws
• keep the process-exit path from being skipped after listeners have already stopped

Validation

• Complete Java suite passed in the Vibe extraction workspace.

Review state

Draft: requires explicit cleanup-failure injection across desktop, service, and embedded modes before it should merge.

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This replaces OpenSageTV#7, which was opened against an intermediate fork instead of the canonical SageTV repository. The topic was replayed without patch changes onto the current canonical master.

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[jzhvymetal]

Closing because the cleanup/linkage exception is currently theoretical. Normal startup and repeated shutdown tests pass, but no real or injected failure proves a server is left alive by this path, and the required desktop/service/embedded failure-injection matrix has not been completed. There is no demonstrated maintenance benefit yet.