A5: `<Text>` always carries `flexShrink: 1` on wrap-family modes

[re-marked]

Imported from the local Yokai shakedown tracker as A5.

Project metadata: category=A: Core API, effort=0 (subsumed), impact=unknown, risk=unknown, when=with A1.

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Status: OPEN (related to A1; the fix landed for truncate modes was reverted)

Where: Text.tsx memoizedStylesForWrap — 'wrap' and 'wrap-trim' modes set flexShrink: 1

Symptom: Nested Text inside a column-flex parent containing larger siblings → yoga shrinks the wrapping Text. Its content wraps to a 2nd line that's invisible because of height: 1 on the parent. Looks identical to fixed-position truncation, but silent.

Common manifestation: title bar fights with file list — title bar's text gets shrunk by yoga to make room for the file list's natural width, title text wraps to invisible 2nd line.

Workaround: put the title in a <Box flexShrink={0}> wrapper, OR use explicit width on the title's container (subject to A1 caveats — the wrapper might still allow basis to be wrong).

Proper fix: wrap-mode Text shouldn't make itself shrink-eligible by default. Wrap-when-necessary should kick in only when yoga has actually committed less width than natural during the EXACTLY pass — not preemptively make the Text a flex-shrink victim during the AtMost basis pass.

This is the same root issue as A1 — measureTextNode reporting wrapped/truncated dimensions during intrinsic measurement gets baked in as basis, and flexShrink: 1 then locks the wrong basis. Fix A1 properly and A5 mostly evaporates.

Effort: dependent on A1. If A1 is fixed at the measure layer, A5's flexShrink: 1 becomes safe to keep (basis is now natural; flex math distributes correctly).

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B. Layout footguns

These are documentable gotchas more than bugs — yoga / CSS-flex semantics that are correct per spec but trip TUI-context expectations.

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[re-marked]

Subsumed by PR #89 — fix(dom): measureTextNode returns natural in Undefined mode (closes #51, #58). The Text wrap-family flexShrink behavior was the same root cause as the nested-text-truncation bug. See 9224140 for the fix and d5d8789 for the test coverage that pins the resolved invariant. Project board status flipped accordingly.