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/ai.fish

@@ -1,13 +0,0 @@
-function ai --description 'Choose and launch an AI CLI via gum'
-    set -l choice (gum choose --header 'AI CLI' claude opencode codex hermes fractal)
-    test -n "$choice"; or return  # cancelled (Esc / Ctrl-C) → bail out
-
-    switch $choice
-        case claude
-            claude --dangerously-skip-permissions
-        case '*'
-            # labels match the binary names, so just run it
-            # add a dedicated `case` here if another tool needs flags
-            $choice
-    end
-end