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/extract_agents.fish

@@ -1,18 +0,0 @@
-function extract_agents -d "Copy all AGENTS.md files to a target directory while preserving structure"
-    set -l out_dir $argv[1]
-
-    # Validate input
-    if test -z "$out_dir"
-        echo "Error: Output directory required."
-        echo "Usage: extract_agents <absolute_or_relative_output_path>"
-        return 1
-    end
-
-    # Ensure output directory exists
-    mkdir -p $out_dir
-
-    # Find and copy preserving relative paths
-    fd -t f -g "AGENTS.md" -x cp --parents "{}" $out_dir
-
-    echo "Extraction complete. Check $out_dir."
-end