Simplify omarchy-bar into a bar-settings and bar-plugin split

The omarchy-bar command had grown three overlapping ways to inspect the
bar (show/layout/list/options, plus selected/active/available/widgets
aliases) and mixed layout mutation in with bar-level settings. Untangle
it into two focused commands:

- omarchy-bar keeps only the bar-level settings that write shell.json:
  use, reset, position, transparent, and settings. reset now delegates
  to `use omarchy.bar` rather than duplicating the del(.bar.id) write.
- omarchy-bar-plugin owns all layout mutation: add, move, remove, set,
  and replace, with the placement flags and jq resolve/anchor helpers.
  `omarchy bar plugin ...` routes here via the dispatcher.

Drop the inspection commands entirely: the layout is visible on the bar,
the config is shell.json, and widget/option ids come from
`omarchy plugin list`. Nothing consumed the show output programmatically
except tests. This also removes omarchy-bar-position, whose jq write was
a duplicate of `omarchy bar position`.

Strip environment-invariant guards (require_command, require_omarchy_path)
that defended against jq or OMARCHY_PATH being absent — neither happens on
a real system. Keep the user-input validation (--section/--index) and the
atomic shell.json write.

Update callers (service install/remove, refresh-shell, plugin-clone,
plugin enable), keybindings, the menu, tests, and docs to the new split.

bin/omarchy-plugin

@@ -2,8 +2,8 @@
 
 # omarchy:summary=Manage Omarchy shell plugins and bar widgets
 # omarchy:group=plugin
-# omarchy:args=<list|rescan|enable|disable|add|update|remove|clone|edit|validate|bar> [...]
-# omarchy:examples=omarchy plugin list | omarchy plugin add https://github.com/acme/omarchy-weather.git | omarchy plugin update --all | omarchy plugin clone omarchy.clock local.clock | omarchy plugin bar settings
+# omarchy:args=<list|rescan|enable|disable|add|update|remove|clone|edit|validate> [...]
+# omarchy:examples=omarchy plugin list | omarchy plugin add https://github.com/acme/omarchy-weather.git | omarchy plugin update --all | omarchy plugin clone omarchy.clock local.clock
 
 set -euo pipefail
 
@@ -36,10 +36,7 @@ Make your own:
   edit [id]                           Open a user plugin directory in a shell
   validate <plugin-folder>            Check a plugin's manifest (for authors)
 
-Bar commands (delegate to 'omarchy bar'; run 'omarchy bar --help' for details):
-  bar settings                        Open the inline bar config panel
-  bar list|layout|options|use|reset|add|move|remove|set|position|transparent
-  widget|widgets                      Alias of 'bar list'
+Bar widgets are placed in the layout with 'omarchy bar plugin'.
 
 Examples:
   omarchy plugin add https://github.com/acme/omarchy-weather.git --enable
@@ -169,7 +166,7 @@ plugin_enabled() {
   [[ $result == "ok" ]] || fail "plugin '$id' is not known; run: omarchy plugin rescan"
 
   if [[ $enabled == "true" && $# -gt 0 ]]; then
-    omarchy-bar move "$id" "$@"
+    omarchy-bar-plugin move "$id" "$@"
     echo "Enabled and moved $id"
   elif [[ $enabled == "true" ]]; then
     echo "Enabled $id"
@@ -460,26 +457,6 @@ plugin_edit() {
   printf '%s\n' "$dir"
 }
 
-# ---------------------------------------------------------------- bar
-
-bar_command() {
-  local command="${1:-list}"
-  [[ $# -gt 0 ]] && shift || true
-
-  case "$command" in
-  edit | settings)
-    (( $# == 0 )) || fail "bar settings does not take arguments"
-    exec omarchy-launch-bar-settings
-    ;;
-  -h | --help | help)
-    usage
-    ;;
-  *)
-    exec omarchy-bar "$command" "$@"
-    ;;
-  esac
-}
-
 command="${1:-}"
 case "$command" in
 list | ls)
@@ -522,10 +499,6 @@ validate)
   shift
   exec omarchy-plugin-validate "$@"
   ;;
-bar | widget | widgets)
-  shift
-  bar_command "$@"
-  ;;
 -h | --help | help | "")
   usage
   ;;