server: own final session sweep

[yisding]

Problem

VoiceServer's final forced SessionManager.stop_all() sweep was the module's last raw task spawn. Its hard deadline may return while a cancellation-resistant Session teardown is still unwinding, leaving that survivor anonymous even though restart is correctly fenced.

Changes

• run the final hard sweep through a dedicated RuntimeTaskScope
• assign the stable task name easycat-voice-server-session-sweep
• preserve aggregate stop reports, hard-timeout error recording, retry fences, and cleanup ordering
• verify completed failed sweeps leave the scope and retain Session state for retry
• add a cancellation-resistant timeout regression proving the named sweep remains owned until settlement
• reduce the reviewed raw-task-spawn inventory from 30 to 29

Why / impact

The final Session sweep now remains attached to VoiceServer's explicit cleanup owner across a hard-timeout return. Retry behavior stays unchanged, and the module no longer contains grandfathered raw spawns.

Root cause

The hard sweep relied on the legacy hard-timeout background ledger and predated WS2.5's named task ownership.

Checks

• focused failed/timeout sweep and source-inventory tests — 12 passed across focused runs
• full VoiceServer lifecycle file outside the sandbox — 25 passed / 4 skipped
• Ruff on changed Python files — passed
• mypy on voice_server.py — passed
• pre-commit hooks — passed

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