fix: nomarchy-manual opens local README, not an Omarchy URL

The script hardcoded `xdg-open https://learn.omacom.io/2/the-nomarchy-manual`
— an upstream Omarchy page. Users hitting "Help → Manual" in nomarchy-menu
were sent to an unrelated site, and there's no nomarchy.org canonical
docs URL to point at instead.

Now opens `$HOME/.local/share/nomarchy/README.md`, which lives on every
installed system (per SKILL.md's "Out of Scope" note about
`~/.local/share/nomarchy/`) and links every doc in `docs/`. Falls back
to a notify-send "run nomarchy-update?" message if the source tree
isn't synced.

Pillar 6 entry in docs/ROADMAP.md updated to (Shipped).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/ROADMAP.md

@@ -97,7 +97,7 @@ Each PR description should reference the row(s) in `docs/SCRIPTS.md` it closes,
 - `docs/KEYBINDINGS.md` auto-generator (Shipped).
 - `docs/TROUBLESHOOTING.md` (Shipped).
 - `docs/index.md` / README docs index (Shipped — `README.md` links every doc in `docs/`).
-- `nomarchy-manual` — currently `xdg-open`s `learn.omacom.io/2/the-nomarchy-manual` (an Omarchy URL). Re-target at a Nomarchy docs URL, or repurpose as a curated `xdg-open` to the local `docs/` index, or delete.
+- `nomarchy-manual` — opens the local `~/.local/share/nomarchy/README.md` via `xdg-open` (Shipped).
 
 ## 7. Pillar: Test, CI, release
 
@@ -121,6 +121,7 @@ Each PR description should reference the row(s) in `docs/SCRIPTS.md` it closes,
 
 (Move items here when they land — keep them brief, link the commit/PR.)
 
+- _2026-05-18_ — `nomarchy-manual` re-targeted at local docs. The script's `xdg-open` previously pointed at `https://learn.omacom.io/2/the-nomarchy-manual` — an upstream Omarchy URL that opened an unrelated page when users hit the menu's Help entry. Now opens `~/.local/share/nomarchy/README.md` (the local docs index per `SKILL.md`'s "Out of Scope" note), with a `notify-send` fallback if the source tree isn't synced.
 - _2026-05-18_ — Docs hygiene: STRUCTURE.md "Root Directory" + Pillar 6 reality-check. `docs/STRUCTURE.md` listed three top-level files that don't exist (`GEMINI.md`, root-level `STRUCTURE.md`, `TODO.md`) — replaced with an accurate root listing plus a `docs/` sub-tree that names every doc. Pillar 6 in this file had `nomarchy-welcome`, `docs/TROUBLESHOOTING.md`, and the "docs index" bullet still marked Next despite all three shipping on 2026-04-26 — moved to `(Shipped)`. `nomarchy-manual` bullet's "orphaned reference today" claim was stale (the script is called from `nomarchy-menu` and `nomarchy-theme-install`); rewritten to reflect the real remaining issue — its hardcoded `xdg-open https://learn.omacom.io/2/the-nomarchy-manual` is an Omarchy URL.
 - _2026-05-18_ — Installer state.json is now schema-driven. Replaced the heredoc in `installer/install.sh` that hardcoded the JSON literal (theme/dns/wifi/features/etc.) with a `nix eval` of `lib/state-schema.nix`'s `system` block, overlaid with the installer-chosen timezone. Closes the last source-of-truth split after the centralization batch — adding a new default in the schema now reaches the installer with no further plumbing. Output is identical modulo alphabetical key ordering (Nix's `builtins.toJSON` sorts keys; toggle scripts read/write via `jq` so it's invisible to them). Dry-run path unchanged (still bind-mounts a fake `/mnt` so the generator's absolute paths resolve correctly). `bash -n` + `shellcheck --severity=error` clean.
 - _2026-05-18_ — Complete the hybrid-GPU wiring + fix unoverridable state-derived options. Two related fixes shipped together. **(1)** `nomarchy.system.features.hybridGPU = true` now wires the full NVIDIA driver stack (`services.xserver.videoDrivers = ["nvidia"]`, `hardware.graphics.{enable,enable32Bit}`, `hardware.nvidia.{modesetting,powerManagement}.enable`, `package = nvidiaPackages.stable`, `boot.kernelParams += "nvidia-drm.modeset=1"`) — was previously enabling only `supergfxd` mode-switching while leaving the system with no NVIDIA driver loaded, so mode switches silently no-op'd. All knobs use `lib.mkDefault` so a downstream `system.nix` can pin a beta driver, flip to the open kernel module, etc. Bus-ID prime config (per-machine) stays user-supplied — `docs/OPTIONS.md` has the full recipe. **(2)** Both `core/system/state.nix` and `core/home/state.nix` now use `lib.mkDefault` on every state.json-derived assignment, fixing a class of "I set X in my system.nix but it doesn't take effect" bugs (the state-derived value was at default priority and conflicted with the user's same-priority override). Side-effect cleanup: `core/system/state.nix` now also reads from `lib/state-schema.nix` like `core/home/state.nix` does, completing the schema-centralization started two batches ago. Verified `nix flake check` + an override test that flips hybridGPU via an overlay and confirms the entire driver stack engages.