server: own listener cleanup tasks

[yisding]

Problem

VoiceServer retained cancellation-resistant HTTP site/runner cleanup operations in a stage-keyed dictionary, but created them with raw asyncio.ensure_future(). The retry ledger prevented duplicate cleanup calls, yet the surviving task itself remained outside named runtime ownership.

Changes

• create listener cleanup operations through a dedicated RuntimeTaskScope
• preserve the existing stage-keyed mapping and exact retry behavior
• invoke each cleanup callable inside the named owner task, supporting the existing generic awaitable contract
• name stages such as easycat-voice-server-listener-cleanup-http-site-stop
• assert a timed-out site cleanup remains in both the retry ledger and scope, then leaves the scope after retry
• reduce the reviewed raw-task-spawn inventory from 31 to 30

Why / impact

A site or runner cleanup that survives its hard deadline now has one explicit task owner as well as a stable retry key. Later stop() calls still await the original operation instead of racing a second listener teardown.

Root cause

The retry-safe listener ledger was added before the shared runtime task-scope abstraction and had not yet been migrated in WS2.5.

Checks

• focused timeout/retry and source-inventory tests — 11 passed
• full VoiceServer lifecycle file outside the sandbox — 24 passed / 4 skipped
• Ruff on changed Python files — passed
• mypy on voice_server.py — passed
• pre-commit hooks — passed

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