Lab #1221: Interactive finder silently drops the preview pane on narrower terminals, and layout selection is unstable

Description

Two related layout problems in the interactive finder (swamp model search, model type search, data search, …):

(a) The preview pane is silently discarded below a width threshold. At ≤~88 columns the finder drops the entire right-hand preview pane and switches to a list-only "compact" layout. All preview content — model type, version, methods, argument schemas, data metadata — becomes invisible, with no indicator that it exists and no way to reach it. The footer even loses its Ctrl-u/d scroll preview hint. Measured threshold: preview present at ≥90 cols, gone at ≤88. 80 columns — the classic default terminal width — always loses it.

(b) The layout choice is unstable / environment-sensitive. The same command at the same terminal size renders different layouts run-to-run and across terminals, sometimes degrading even with abundant space:

swamp data search at 200×50 in tmux renders a single-column list with a 2-line truncated inline preview (Model: sp (@kneel/super-productivit…) and NO side pane — while the same command in a real ~200-col terminal renders the full two-column pane.
swamp model search at width 120 renders compact in one emulator, two-column in another.
Right at width 90 it flip-flopped between two-column and compact across identical back-to-back runs — suggesting a racy threshold or an async-load ordering bug in the layout decision.

The compact fallback also drops the title/header bar (─swamp─ … models search ─ becomes a bare Search: ▏ prompt).

Steps to reproduce

(a) In an 80-column terminal (or COLUMNS=80), run swamp model search. There is no preview pane and no way to see any selected model's details. Widen to ≥90 columns and the preview reappears. (b) Run swamp data search in a wide (≥120-col) terminal a few times and/or across tmux vs. your normal terminal; observe the preview render as a full side pane in some cases and as a truncated inline 2-liner (or not at all) in others at the same size.

Expected

The preview should remain reachable at any usable width — reflow it below the list, or provide a toggle/scroll, rather than silently discarding it.
Layout selection should be deterministic for a given (width, height, result count).

Environment

swamp 20260716.194319.0-sha.df9fc306
Linux (x86_64), zsh; tput cols = 80 on this machine
Reproduced in tmux 3.2a and a Python pyte emulator across widths 40–200.
TUI stack per #708: Ink + yoga-layout + marked-terminal.

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Relationships

#1221 Interactive finder silently drops the preview pane on narrower terminals, and layout selection is unstable