Consume the card:'read' result view (path, numbered lines, totalLines, lang)
the read backend PR added. ReadBlock (ui-primitives) draws a per-line gutter
with each line's own file number, shiki highlighting via a new highlightLines
returning per-line token arrays, a 显示 X / Y 行 window note, a height cap
matching TerminalBlock, and a copy control. read-card-model is the single
resultView derivation; a keyed ReadRow registers under read with the card
resident under its path-link summary. The generic fallback and the details
panel are read-aware. Fixture gains a windowed read turn for the built-boot
snapshot.
