feat(uninstall): add uninstall.sh script

Bash equivalent of uninstall.ps1: removes managed files, extension/
skill ledger entries, semantic retrieval, and the saved Quickupdate
selection for a selected client.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

scripts/uninstall.sh

@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+dry_run=false
+client=""
+force=false
+summary=false
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --dry-run) dry_run=true; shift ;;
+    --force) force=true; shift ;;
+    --summary) summary=true; shift ;;
+    --client) client=${2:?--client requires a value}; shift 2 ;;
+    *) printf 'Unknown argument: %s\n' "$1" >&2; exit 1 ;;
+  esac
+done
+
+root=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
+. "$root/scripts/lib/plugins.sh"
+. "$root/scripts/lib/manifest.sh"
+. "$root/scripts/lib/install-targets.sh"
+. "$root/scripts/lib/semantic-retrieval.sh"
+
+client=$(read_install_client "$client")
+home_path=${HOME:?HOME is required}
+generated="$root/generated"
+
+mapfile -t targets < <(get_install_targets "$generated" "$home_path" bash "$client")
+installed_count=0
+for target_pair in "${targets[@]}"; do
+  [ -f "$(manifest_path "${target_pair#*|}")" ] && installed_count=$((installed_count + 1))
+done
+if [ "$dry_run" = false ] && [ "$installed_count" -eq 0 ]; then
+  printf 'Not installed, nothing to uninstall.\n' >&2
+  exit 1
+fi
+
+if [ "$dry_run" = false ] && [ "$force" = false ]; then
+  if [ ! -t 0 ] || [ "${CI:-}" = true ] || [ "${AI_CONFIG_NO_INTERACTIVE:-}" = 1 ]; then
+    printf 'Refusing to uninstall without confirmation in a non-interactive session. Pass --force to proceed.\n' >&2
+    exit 1
+  fi
+  printf 'This removes the managed configuration, extensions, and semantic retrieval setup for %s under %s.\n' "$client" "$home_path"
+  printf 'Backups already on disk are kept; anything this setup never installed is left untouched.\n'
+  read -r -p "Type 'yes' to continue: " confirm || confirm=""
+  if [ "$confirm" != yes ]; then
+    printf 'Cancelled, nothing was removed.\n'
+    exit 1
+  fi
+fi
+
+stamp=$(date +%Y%m%d-%H%M%S)
+empty_source=$(mktemp -d)
+cleanup() { rm -rf -- "$empty_source"; }
+trap cleanup EXIT
+
+for target_pair in "${targets[@]}"; do
+  destination=${target_pair#*|}
+  if [ ! -f "$(manifest_path "$destination")" ]; then
+    [ "$summary" = true ] || printf 'SKIP %s (not installed)\n' "$destination"
+    continue
+  fi
+  ai_config_root=$destination
+  command -v cygpath >/dev/null && ai_config_root=$(cygpath -m "$destination")
+  sync_managed_destination "$empty_source" "$destination" "$stamp" "$ai_config_root" '' '' "$dry_run" "$summary"
+  if [ "$dry_run" = false ]; then
+    rm -f -- "$(manifest_path "$destination")"
+    [ -n "$(find "$destination" -mindepth 1 -maxdepth 1 2>/dev/null)" ] || rmdir -- "$destination" 2>/dev/null || true
+  fi
+done
+
+selected_plugins=()
+sync_configured_plugins "$root" "$client" "$home_path" "$dry_run" false selected_plugins "$summary"
+sync_semantic_retrieval "$root" "$client" "$home_path" false "$dry_run" false "$summary"
+
+if [ "$dry_run" = false ]; then
+  remaining=0
+  for target_pair in "${targets[@]}"; do
+    [ -f "$(manifest_path "${target_pair#*|}")" ] && remaining=$((remaining + 1))
+  done
+  if [ "$remaining" -eq 0 ]; then
+    config_root="$home_path/.my-ai-configuration"
+    rm -f -- "$config_root/selection.json"
+    [ -n "$(find "$config_root" -mindepth 1 -maxdepth 1 2>/dev/null)" ] || rmdir -- "$config_root" 2>/dev/null || true
+  fi
+fi
+
+if [ "$summary" = true ]; then
+  suffix=
+  [ "$dry_run" = false ] || suffix=', dry-run'
+  printf 'Uninstall: PASS | %s%s\n' "$client" "$suffix"
+elif "$dry_run"; then printf 'PASS uninstall dry-run\n'; else printf 'PASS uninstall\n'; fi