Introduce a reserved left gutter column with absolute line numbers in the
TUI/grid frontend — the foundational piece of the UX arc (docs/ux-arc-
framing.md). Default OFF (Emacs tradition), so zero layout/coordinate
change until a window opts in.
- window.rs: LineNumberMode { Off, Absolute } + per-window `line_numbers`
field + `gutter_width()` (digits(line_count) + PAD) + `decimal_digits`.
- editor.rs: the gutter is one viewport shift at the paint site
(cell_origin.col += gutter_w, cell_size.cols -= gutter_w) — every
viewport-relative painter (text, syntax, diag underline, search) stays
gutter-agnostic. The sites that read rect.origin.col directly get a
manual +gutter_w: cursor placement, local selection, mouse hit-test
(a gutter click maps to line start, Q#UX6). paint_line_number_gutter
writes right-aligned dim digits alloc-free.
- overlay_paint.rs: remote-presence cursor/selection shift by gutter_w.
- Lua: pmacs.window.set_line_numbers/line_numbers +
window.toggle-line-numbers command.
No protocol/daemon change (frontend-local, Q#UX1). Tests: gutter render
(right-aligned digits + past-EOF blanks) + decimal_digits.
Validated: fmt clean; clippy --lib clean both flavors; 1439 lib tests pass
both flavors. Needs a human eyeball (coordinate-math change) before the PR.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014TXbAwk27agwhrNNrhLi2U
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