feat(tools): seed guest state at boot so captures render wallpapers (item 28c)

theme-shot guests had no ~/.nomarchy, so the session's exec-once
`nomarchy-theme-sync wallpaper` died on missing state and captures
showed a bare base-color backdrop. Seed theme-state.json via tmpfiles
before greetd starts the session — the real exec-once path now paints.
(A post-boot testScript seed is too late for exec-once, and a manual
re-run fails without WAYLAND_DISPLAY: awww's client socket is
display-named.)

V2: summer-night capture renders wallpaper + inverted cream bar +
menu + placeholder dim, all coherent.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

agent/JOURNAL.md

@@ -17,6 +17,23 @@ Template:
 
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+## 2026-07-05 — capture harness paints wallpapers (iteration #44, item 28c)
+- **Task:** item 28c harness gap — captures rendered a bare base-color
+  backdrop because the guest had no `~/.nomarchy` runtime state.
+- **Did:** tools/theme-shot.nix now seeds theme-state.json via tmpfiles
+  at boot (before greetd), so the session's exec-once
+  `nomarchy-theme-sync wallpaper` paints naturally; dropped the
+  testScript seed+manual-repaint (too late for exec-once; manual runs
+  also lack WAYLAND_DISPLAY, which awww's client needs to find its
+  socket).
+- **Verified:** V2 — summer-night capture shows wallpaper + cream
+  inverted bar + menu + placeholder dim, all coherent. V1 flake check
+  green.
+- **Pending:** identity-theme vibe capture (lumon/retro-82); the
+  `[human]` icon-weight call; HARDWARE-QUEUE eyeballs.
+- **Next suggestion:** item 28c identity capture, or park 28 for
+  Bernardo's taste calls.
+
 ## 2026-07-05 — clock zone tooltip (iteration #43, LATER item)
 - **Task:** LATER › auto-timezone Waybar tooltip. Bullet deleted.
 - **Did:** the clock tooltip's first line is now the zone —