feat(live): #57 Install Nomarchy desktop entry + Tools row

Always-visible install surface on the live ISO: xdg.desktopEntries
(Terminal=true) plus Tools › Install Nomarchy (self-gated on
nomarchy-install on PATH). Welcome toast mentions the app. Close #57.

Verified: V1 (live eval + HM menu rebuild). V2 pending: ISO smoke.

agent/JOURNAL.md

@@ -17,6 +17,16 @@ Template:
 
 ---
 
+## 2026-07-10 — #57 live Install Nomarchy affordance
+- **Task:** NEXT #57 — durable live-ISO install surface (not only toast).
+- **Did:** `xdg.desktopEntries.nomarchy-install` (Terminal=true) on live
+  HM; Tools › Install Nomarchy self-gated on `command -v nomarchy-install`;
+  welcome toast wording updated. Closed #57.
+- **Verified:** **V1** — live config eval exposes entry name/exec;
+  `downstream-template-home` rebuilds with menu gate. **V2 pending:**
+  ISO rebuild + smoke that the .desktop appears in the session.
+- **Next suggestion:** #58 `nomarchy-detect-hw` CLI.
+
 ## 2026-07-10 — #63 generated Waybar logo + powermenu
 - **Task:** NEXT #63 — reverse parity: generated bar lacked whole-swap
   logo → menu and power icon → power menu.