shell: fish functions -> ~/.local/bin executables + bash/zsh ports; manage ~/.agents

- 16 cross-shell utilities converted to sh/bash chezmoi executables:
  ai c2p cp-appid extract_agents fab gdc gh-sonr-org-migrate ghg-clone
  ghn gho git-summary launch_omp_livediff_overlay lc-elir mdcp mdp pj
  (ghg-clone not named ghg: unrelated cargo binary owns that name)
- cwd/history helpers stay per-shell: yy c cd clip-last + ghg/ghn/gho
  cd-wrappers in bash/functions/ and zsh/functions/, loaded by rc files
- fish keeps only shell-state functions; converted ones now hit PATH
- cp-appid ignore gating moved to .local/bin path
- dot_agents/skills: 82 skills materialized from dotstate storage so
  dot_claude skill symlinks resolve on fresh bootstrap; dotstate
  profile/symlinks.json released .agents/skills .bashrc .zshrc

dot_config/fish/functions/ghn.fish

@@ -1,29 +1,4 @@
-function ghn -a repo
-    if test -z "$repo"
-        echo "usage: ghn <repo-name>" >&2
-        return 1
-    end
-
-    set -l host (gum choose "prad.codes" "github.com")
-    or return 1
-
-    if test "$host" = prad.codes
-        set -l owner (tea organizations list -o simple | string trim | gum choose)
-        or return 1
-
-        tea repos create --name $repo --owner $owner --private
-        or return 1
-
-        ghq get https://prad.codes/$owner/$repo
-        and cd (ghq root)/prad.codes/$owner/$repo
-    else
-        set -l owner (gum choose "prdlk" "wltbs")
-        or return 1
-
-        gh repo create $owner/$repo --private
-        or return 1
-
-        ghq get github.com/$owner/$repo
-        and cd (ghq root)/github.com/$owner/$repo
-    end
+function ghn -a repo --description 'create repo + cd (logic in ~/.local/bin/ghn)'
+    set -l dir (command ghn $repo); or return
+    cd $dir
 end