Add ~/.omp config; nvim git-repo external; ya pkg install hook

- dot_omp: agent config/keybindings/mcp/themes/commands + loop defs,
  goals, run-loop.sh; dotstate config.yml symlink materialized; dbs,
  logs, sessions, memories, blobs, caches, .env (secret), and
  managed-skills excluded
- .chezmoiexternal.toml: prdlk/nvim as git-repo external — no
  refreshPeriod + ff-only pull, local checkout wins over remote
- yazi plugins: vendored source copies dropped (target-ignored already);
  package.toml is the manifest, installed via run_onchange ya pkg
  install hook; stale piper/easyjump pins bumped to match live content
- herdr: plugins/github checkout, logs, session.json, .bak,
  release-notes dropped from sync (herdr-managed machine state)

.gitignore

@@ -1,9 +1,7 @@
 /dot_config/lazygit/dot_omc
 /dot_config/tmux/plugins
-/dot_config/yazi/plugins
 
 # Beads / Dolt files (added by bd init)
 .dolt/
 *.db
 .beads-credential-key
-/dot_config/herdr/plugins/github/official.browser-ff2a44eccae9