server: own WebSocket close fan-out

[yisding]

Problem

When VoiceServer escalated a natural drain, it spawned one raw close task per active WebSocket and kept only the hard-timeout boolean from a gather(return_exceptions=True). Completed connection-close failures were silently discarded, and cancellation-resistant closes had no named owner.

Changes

• run raw-WebSocket connection closes in a dedicated RuntimeTaskScope
• assign stable per-connection task names
• inspect completed gather results and log unexpected exceptions with the exact task identity
• preserve the hard deadline and existing timeout warning
• add success/failure regression coverage for task naming, quiet success, and observable close failure
• reduce the reviewed raw-task-spawn inventory from 32 to 31

Why / impact

A broken connection close is now attributable to easycat-raw-ws-close-<key>, while a close that resists the hard-timeout cancellation remains scope-owned after teardown advances.

Root cause

The close fan-out used return_exceptions=True to isolate sibling failures but discarded the returned list, and its manual raw spawns predated WS2.5 task scopes.

Checks

• focused close/result-policy and source-inventory tests — 11 passed
• full VoiceServer lifecycle file outside the sandbox — 22 passed / 4 skipped
• Ruff on changed Python files — passed
• mypy on voice_server.py — passed
• pre-commit hooks — passed

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