Feature request: session-only switch (`s` key) in /effort and /advisor pickers, matching /model

Summary

The /model picker supports pressing s to switch models for the current session only, while Enter saves the selection as the default for new sessions (changelog v2.1.x: "Press s in the picker to switch models for the current session only"). This is great.

/effort and /advisor have no equivalent: any selection is immediately saved as the default for new sessions. The only session-only path for effort is the --effort <level> CLI flag at launch — nothing mid-session.

Problem

Temporarily raising effort for one hard task (e.g. high → xhigh) silently overwrites the saved default. Users who forget to switch back inherit the new level in every future session. Same for the advisor model. We hit exactly this today: a quick /effort change overwrote a deliberately configured default in settings.json.

Proposal

Parity with /model: in the /effort and /advisor pickers, Enter = save as default (current behavior), s = apply to the current session only.

Environment

• Claude Code v2.1.212, Linux (VPS, terminal)

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