Fix comments left stale by the Hosted, alert-pause, and Surface-move work

[dormouse-bot]

Comment-only cleanup in files none of the open PRs touch. Each of these comments described code or specs that this week's merges (#867–#872, #885–#888) changed underneath them. No behavior changes.

• vscode-ext/src/burrow.ts: createRelaySocket still cited engines.vscode ^1.85.0 / Node 18. The floor is ^1.92.0 (Node 20.14, per docs/specs/vscode.rationale.md), and the ws fallback is still needed for the same reason. initBurrow pointed at "the module header", which is now a one-line pointer, so it now names docs/specs/vscode.md → "Burrow: a service in the extension host" directly.
• lib/src/lib/alert-manager.ts: scheduleDeferredNotification said the timer matters "for output that never goes quiet". After the pause rework, output that never goes quiet just re-arms the timer. The timer is what releases a deferral after output that never confirmed busy, since QuiesceDetector settles only from BUSY. It also releases one after a command boundary, and publishes a pause's end.
• lib/src/lib/alert-delivery-scheduler.ts, lib/src/lib/alert-delivery.ts: speech can now be host-fetched managed-voice audio as well as window.speechSynthesis, matching the Authority row in docs/specs/alert.md.
• lib/src/remote/client/pocket-client.ts: the heartbeat comment cited pocket-app.md, which says nothing about heartbeats. It now cites docs/specs/relay.md → "Routing", as lib/src/remote/ws.ts does.
• lib/src/components/wall/wall-handles.ts: PreparedSurfaceMove was inserted between WallHandle and its doc comment. Its declaration now sits above that comment.
• lib/src/stories/PhoneFrame.tsx, scripts/lint-kit.mjs: the consumer lists had grown stale (the frame is also used by the one-time and pairing stories, and lint-kit by every lint). They now describe the consumers instead of listing them. The normalizeEol "shared with the self-tests" claim was dropped, since no self-test imports it.

No regression test, because only comments change. I couldn't run the suite locally: this runner has no network access to install dependencies, so CI is the check.

argos/storybook-webkit reports one changed screenshot waiting for a decision. A comment-only diff can't move a screenshot, and #899, which changes only Windows test fixtures, shows the same single WebKit change. Every other check is green.

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