Link Omarchy agent skills into Hermes skill directories

Hermes was missing from the provision-user symlink list that already
covers Claude, Codex, Pi, Antigravity, and ~/.agents. Add ~/.hermes/skills
plus existing ~/.hermes/profiles/*/skills. Migration for current installs.

docs/file-layout.md

@@ -198,11 +198,12 @@ Runs once per user. It does **not** copy `~/.config/**`, `~/.bashrc`,
 `flags.lua`, or the nautilus extensions — `/etc/skel` already seeded those.
 It only does the things `/etc/skel` can't:
 
-- Skill symlinks `~/.{agents,claude,codex,pi/agent}/skills/<name>` →
+- Skill symlinks `~/.{agents,claude,codex,pi/agent,hermes}/skills/<name>` (and each `~/.hermes/profiles/*/skills/<name>`) →
   `$OMARCHY_PATH/default/agents/skills/<name>`, looping over every skill
   directory there (currently `omarchy` and `diagnose-crash`) so new skills
   need no edit. Symlinks (not copies) so `omarchy dev link` against a dev
-  checkout repoints them correctly.
+  checkout repoints them correctly. Hermes profile dirs are only linked when
+  they already exist — provision does not create Hermes profiles.
 - `xdg-user-dirs-update` (Templates/Public/Desktop folded back into `$HOME`)
   and `~/.config/gtk-3.0/bookmarks` (needs `$HOME` expansion).
 - Hyprland's package-owned default input reads `XKBLAYOUT` / `XKBVARIANT`