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/cp-appid.fish

@@ -1,43 +0,0 @@
-function cp-appid --description "Fuzzy-pick a desktop app ID and copy to clipboard"
-    set -l search_dirs \
-        /usr/share/applications \
-        /usr/local/share/applications \
-        $HOME/.local/share/applications \
-        /var/lib/flatpak/exports/share/applications \
-        $HOME/.local/share/flatpak/exports/share/applications \
-        /var/lib/snapd/desktop/applications
-
-    set -l existing_dirs
-    for d in $search_dirs
-        test -d $d; and set -a existing_dirs $d
-    end
-
-    test (count $existing_dirs) -eq 0
-        and echo "No application directories found." >&2
-        and return 1
-
-    set -l chosen (
-        fd --type f --extension desktop . $existing_dirs \
-        | while read -l f
-            set -l app_id (basename $f .desktop)
-            set -l name (rg -m1 '^Name=' $f | string replace 'Name=' '')
-            test -z "$name"; and set name $app_id
-            echo "$name\t$app_id"
-        end \
-        | sort -u -t\t -k1 \
-        | fzf \
-            --delimiter='\t' \
-            --with-nth=1,2 \
-            --prompt="App ID › " \
-            --height=50% \
-            --layout=reverse \
-            --border=rounded \
-            --info=inline
-    )
-
-    test -z "$chosen"; and return 0
-
-    set -l app_id (string split '\t' $chosen)[2]
-    echo -n $app_id | wl-copy
-    echo "Copied: $app_id"
-end