docs(omarchy): #78 Omarchy → Nomarchy migrant one-pager

Add docs/OMARCHY.md for users coming from Omarchy (VISION § F). Leads
with the one real difference — imperative dotfiles vs a declarative flake
built via the menu, with rollback through NixOS generations — then maps
the deltas: install (ISO/nomarchy-install or MIGRATION.md), a familiar
keybindings table, theming (SUPER+T / nomarchy-theme-sync), installing
software (home.packages / nix shell, no AUR), and update+rollback
(nomarchy-pull/-rebuild/-home, boot-menu generations, nomarchy-doctor).
Registered in docs/README.md; VISION § F marked shipped.

The Nomarchy side is grounded in the code: keybindings pulled from
keybinds.nix, and every cited command (7), the nsearch alias, and the
named theme slugs (gruvbox/rose-pine/nord) verified to exist. Omarchy-side
claims kept to known facts (Arch, dotfiles, pacman/AUR).

Verification: V0 (docs-only); commands/slugs/binds checked against the tree.

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

agent/JOURNAL.md

@@ -17,6 +17,24 @@ Template:
 
 ---
 
+## 2026-07-10 — #78 Omarchy migrant doc (docs/OMARCHY.md)
+- **Task:** BACKLOG #78 (promoted from PROPOSED) — Omarchy→Nomarchy
+  one-pager (`VISION § F`).
+- **Did:** New `docs/OMARCHY.md`: leads with the config-model shift
+  (imperative dotfiles → declarative flake + menu, rollback via
+  generations), then install (ISO/`nomarchy-install` or MIGRATION.md),
+  a familiar-bindings table, theming (`SUPER+T`/`nomarchy-theme-sync`),
+  packages (home.packages / `nix shell`, no AUR), update+rollback
+  (`nomarchy-pull`/`-rebuild`/`-home`, boot-menu generations,
+  `nomarchy-doctor`). Added to `docs/README.md` map + VISION § F ✓.
+- **Verified:** V0 (docs). Grounded Nomarchy side in code: pulled real
+  binds from `keybinds.nix`; confirmed all 7 cited commands, the `nsearch`
+  alias, and the named slugs (gruvbox/rose-pine/nord) exist. Kept
+  Omarchy-side claims to known facts (Arch, dotfiles, pacman/AUR).
+- **Pending:** none.
+- **Next suggestion:** NEXT head #76 `[blocked:hw]`; last open PROPOSED is
+  auto time-of-day theme pair (`§D`, `[big]` — needs splitting).
+
 ## 2026-07-10 — #77 doctor hibernate/sleep section (V2 PASS)
 - **Task:** BACKLOG #77 (promoted from PROPOSED by Bernardo) — read-only
   hibernate section in nomarchy-doctor (`VISION § C`, #76 follow-on).