docs(agent): file #122 — a crisper fastfetch logo, with the trap named up front

Bernardo 2026-07-14: the fastfetch logo should be crisper, with straight lines.

Filed with the cause rather than the wish. modules/home/fastfetch.nix converts
the vector mark with `chafa --symbols block --size 20x10`, and that symbol class
is the chunkiness: restricted to full/half blocks, a 20x10 grid carries ~20x20
pixels of detail, so every diagonal staircases. chafa 1.18.2 ships sextant (2x3
subcells), quad and wedge — verified present today, so the cheap lever exists.

Named the trap that decides the approach, because trying it first is what
prevents a wasted round: sextants are Unicode 13 Symbols for Legacy Computing,
and if the shipped terminal font lacks them the logo renders as tofu — strictly
worse than chunky. So font coverage in the real Ghostty gets checked before a
symbol class is chosen, and if it is missing, hand-authored box-drawing art is
the honest alternative (and the only way to get genuinely straight lines; any
image→symbol converter approximates).

Also recorded that the three logo surfaces are different renderers — fastfetch,
the ISO splash, the Waybar glyph font — so this item touches one of them, while
a change to the shared logo.svg would hit all three and should be split.

Visual change, so THEME-DESIGN and the honesty rule apply: pass needs
screenshots viewed under two themes, no tofu, accent tracking intact, and the
fastfetch row grid still aligned.

V0: nix flake check --no-build passes. Backlog only.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agent/BACKLOG.md

@@ -126,6 +126,52 @@ pre-existing ISO-pinning gap.
 
 ## NEXT
 
+### 122. A crisper Nomarchy logo in fastfetch
+
+Bernardo 2026-07-14: the ASCII/block logo fastfetch prints should be **crisper,
+with straight lines** — a "high resolution" ASCII logo rather than the chunky
+mark it renders today.
+
+Where it comes from (`modules/home/fastfetch.nix:12-17`): the vendored vector
+mark is rasterised at 220px (`rsvg-convert`), recoloured to `theme.colors.accent`
+with `magick`, and converted at build time by
+`chafa --format symbols --symbols block --size 20x10 --colors full`. **That
+`--symbols block` is the cause**: it restricts chafa to full/half blocks, so a
+20×10 grid carries roughly 20×20 pixels of detail and every diagonal turns into
+a staircase.
+
+Cheap levers, in the order worth trying (chafa 1.18.2 ships them all — verified
+2026-07-14): `--symbols sextant` (2×3 subcells per character — 6× the detail of
+block, and the usual answer to exactly this), `quad`/`wedge` for 2×2, and a
+larger `--size` with a matching `rsvg-convert -w`. `braille` is 2×4 but reads as
+dots, not lines — probably wrong for a logo that wants straight edges.
+
+**The trap that decides the whole approach, and must be checked FIRST:**
+sextants and friends are Unicode 13 *Symbols for Legacy Computing* (U+1FB00–).
+If the shipped terminal font lacks them, the logo renders as **tofu boxes** —
+strictly worse than chunky. Verify coverage in the real terminal (Ghostty) with
+the fonts the distro actually ships (`nerd-fonts-jetbrains-mono` et al.) before
+committing to a symbol class; if coverage is missing or partial, the honest
+answer may be a **hand-authored** logo in box-drawing glyphs (`─ │ ┌ ┐ └ ┘ ━ ┃`
++ block elements), which is the only way to get *genuinely* straight lines —
+any image→symbol converter approximates. That would trade the automatic
+accent-recolouring for hand-tuned art, so keep the recolour path
+(`file-raw` + a build-time colorize) either way.
+
+Do **not** conflate the three logo surfaces — they are different renderers and
+a change here touches only the first: fastfetch (this item), the ISO boot splash
+(`hosts/live.nix` `isoSplash`, rsvg→magick), and the Waybar menu glyph
+(`Nomarchy.ttf` U+F000, `modules/nixos/branding/`). The vector source
+(`modules/nixos/branding/logo.svg`) is shared, so a change to *it* hits all
+three — if the SVG is what needs work, say so and split the item.
+
+This is a **visual change**, so `agent/THEME-DESIGN.md` and the honesty rule
+apply: no "it probably looks fine". Pass = the logo reads crisply in a real
+terminal at the shipped font, **screenshots captured and viewed under at least
+two themes** (one generated palette, one whole-swap), no tofu, it still tracks
+the accent on a theme switch, and the fastfetch layout still lines up (the logo
+column and the module list share a row grid — changing `--size` moves it).
+
 ### 120. A netinstall ISO, next to the fat offline one
 
 Bernardo 2026-07-14, after seeing the measured size: **keep the current ISO