steer_session does not trigger playback when Cider is idle

[randileeharper]

Bug

When sending a descriptive music request (e.g. vesper ask "play upbeat morning music"), vesper resolves to steer_session and returns status: "ok", but is_playing is false. The track is queued but Cider does not begin playback. A separate vesper ask "play" is required to actually start audio.

Repro

1. Ensure Cider is not currently playing.
2. Run: vesper ask "play upbeat morning music"
3. Observe: status: "ok", is_playing: false, no audio.
4. Run: vesper ask "play"
5. Music plays.

Environment

• Observed 2026-07-05.
• Resolver: gemma4 26B (A4B MoE) via ollama.
• Cider was potentially in a weird state — may be Cider-side rather than vesper-side. Has not reproduced before.

Expected

steer_session should trigger playback if Cider is currently idle, or vesper should detect the idle state and route through a play action.

Notes

Reported by lychee during first morning of testing. Originally filed in randileeharper/lychee#1, moved here by request.