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)

dot_config/herdr/config.toml.bak

@@ -1,64 +0,0 @@
-onboarding = false
-[ui]
-
-show_agent_labels_on_pane_borders = false
-agent_panel_sort = "priority"
-[keys]
-# tmux-style bindings (prefix is the leader, default ctrl+b)
-split_vertical = "prefix+%"
-split_horizontal = 'prefix+"'
-detach = "prefix+d"
-
-# leader+s opens the workspace ("spaces") picker (settings moves off prefix+s to make room)
-workspace_picker = "prefix+s"
-settings = "prefix+shift+s"
-
-# vim-style j/k move the selection up/down inside the spaces picker
-# (frees pane up/down in navigate mode; use arrows or ctrl+b j/k for pane focus)
-navigate_workspace_up = "k"
-navigate_workspace_down = "j"
-navigate_pane_up = ""
-navigate_pane_down = ""
-
-# leader+. / leader+, step to the next / previous agent in the panel
-next_agent = "prefix+."
-previous_agent = "prefix+,"
-
-# leader+a focuses the agent panel for keyboard browsing
-# (j/k to move, enter to jump, esc to leave) — needs the rebuilt binary
-
-[experimental]
-pane_history = false
-kitty_graphics = true
-
-switch_ascii_input_source_in_prefix = true
-[theme]
-name = "rose-pine"
-auto_switch = false
-
-[[keys.command]]
-key = "ctrl+h"
-type = "plugin_action"
-command = "vim-herdr-navigation.left"
-description = "navigate left (vim/herdr)"
-
-[[keys.command]]
-key = "ctrl+j"
-type = "plugin_action"
-command = "vim-herdr-navigation.down"
-description = "navigate down (vim/herdr)"
-
-[[keys.command]]
-key = "ctrl+k"
-type = "plugin_action"
-command = "vim-herdr-navigation.up"
-description = "navigate up (vim/herdr)"
-
-[[keys.command]]
-key = "ctrl+l"
-type = "plugin_action"
-command = "vim-herdr-navigation.right"
-description = "navigate right (vim/herdr)"
-
-[ui.toast]
-delivery = "system"