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/git-summary.fish

@@ -1,22 +0,0 @@
-function git-summary --description "Aggregate all AGENTS.md files in the current git repo via code2prompt"
-    # Resolve the repo root so it works from any subdirectory
-    set -l repo_root (git rev-parse --show-toplevel 2>/dev/null)
-    if test -z "$repo_root"
-        echo "git-summary: not inside a git repository" >&2
-        return 1
-    end
- 
-    set -l template ~/.config/code2prompt/agents-md.hbs
-    if not test -f $template
-        echo "git-summary: template not found at $template" >&2
-        return 1
-    end
- 
-    # Pass through any extra flags (e.g. --output-file, --tokens)
-    code2prompt $repo_root \
-        --include "AGENTS.md" \
-        --include "**/AGENTS.md" \
-        --template $template \
-        $argv
-end
-