diff --git a/agent/BACKLOG.md b/agent/BACKLOG.md
index cc39ba4..9586882 100644
--- a/agent/BACKLOG.md
+++ b/agent/BACKLOG.md
@@ -140,23 +140,42 @@ with `magick`, and converted at build time by
 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.
+**`--symbols sextant` is the lever, and it is available — verified 2026-07-14 on
+a real Nomarchy machine.** Chase the *fallback*, not one font's charset; this
+was got wrong twice while filing, both times by checking a single font:
 
-**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.
+- The mono face is **per theme** (`ghostty.nix:22` → `t.fonts.mono` from the
+  theme JSON), not stylix's default. **Boreal — the default theme and the base
+  state — is `GeistMono Nerd Font`**; the other 23 themes are `JetBrainsMono
+  Nerd Font`. Any answer must hold for both.
+- Neither of those two faces covers U+1FBxx (sextants), U+2800 (braille) — **and
+  GeistMono covers no block elements (U+2580–259F) or box drawing either**. So
+  **the logo already renders through fontconfig fallback on the default theme
+  today**, and has all along. Fallback is the normal case here, not the risk.
+- Fallback resolves it: `fc-list :charset=1fb00` → **37 families** on a real
+  box, including the shipped `nerd-fonts.caskaydia-cove` plus
+  `noto-fonts`' Noto Sans Symbols 2; `fc-match "GeistMono Nerd Font:charset=1fb00"`
+  picks CaskaydiaCove. Braille: 59 families. **No tofu.**
+
+So the change itself is roughly a one-flag edit (`--symbols block` →
+`sextant`, 2×3 subcells = 6× the detail, likely with a larger `--size` and a
+matching `rsvg-convert -w`). **The work is the verification, not the edit.**
+Two things can still make it look worse, and only a real terminal can say:
+**(1) fallback metrics** — CaskaydiaCove's sextants drawn in GeistMono's cell
+may not align or may differ in stroke weight, and this is precisely the kind of
+seam that looks fine in a VM and wrong on a laptop; **(2)** the mark is
+**diagonal-heavy** (an N-monogram of angled strokes), and diagonals staircase
+under *any* cell symbol — more resolution makes a finer staircase, not a
+straight line. If "straight lines" means the mark itself should be redrawn with
+straight strokes, that is a **logo design change** to `logo.svg` — not a
+renderer tweak — and it hits all three surfaces below. Settle which is wanted
+before touching chafa flags.
+
+**Note the mark is diagonal-heavy** (an N-monogram of angled strokes), which is
+the underlying tension: diagonals staircase under block symbols at *any* size.
+If "straight lines" means the logo itself should be redrawn with straight
+strokes, that is a **logo design change** to `logo.svg`, not a renderer tweak —
+and it would hit all three surfaces below. Settle which is wanted first.
 
 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